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A. Anzelewitz & Co. A. Jaffe & Son, Inc. A. Kamion A.L. Ducommun A.M. Bachrach Adolph Bulova American Filled Watch Case Co. American Waltham Watch Co. American Watch Case Co. American Watch Case Co. of Toronto, Ltd. American Watch Co. Andrew K. Shiebler & Son Apex Watch Case Co. Appleton, Tracy & Co. Arnold Robert Arrow Watch Case Corp. Association of Silver Case Manufacturers Atlantic Watch Case Co. August Sperry Avery & Brown Avon Watch Case Co. Baldwin & Co. Ball, Parker & Waters Ball, Steffany & Co. Bates & Bacon Bay State Watch Case Co. Bayer, Pretz, Felder & Mills Becker-Heckman Co. Bell & Co. Bell Watch Case Co. Belove Watch Case Co. Benjamin J. Warner Bernard Levy Berthoud, A. Bigalke & Eckert Co. Blauer & Sperry Blauer Watch Case Co. Bojar Co. Booz & Co. Booz & Hagstoz Booz & Thomas Booz, Hagstoz & Thomas Boss Watch Case Co. Boston Watch Case Co. Boston Watch Co. Bowman Bowman & Everts Brennan, Michael Brooklyn Standard Watch Case Co. Brooklyn Watch Case Co. Buckley, Preston & Tracy Butler & McCarty Butler, McCarty & Co. Byron L. Strasburger & Co. C. & A. Pequignot C. & C.P. Warner C. & E. Tracy C. Glatz & Co. C. Jacot & Bro. C.E. Hall & Co. C.H. Ankeny & Co. C.K. Colby C.L. Thiery & Co. C.L. Thiery & Sons C.N. Thorpe C.R. Smith & Sons C.W. Westphal California Watch Case Co. Camm Watch Case Co. Camm-Roy Watch Case Co. Capital Watch Case Co. Catlin Celestine Jacot Central Watch Case Co. Charles Glatz Charles L. Thiery (Boston) Charles L. Thiery (New York) Charles Schwitter Chas H. Stone Chas. E. Hale & Co. Chicago Watch Case Co. Cohen & Co. Colby & Johnson Commodore Watch Case Co. Congress Watch Case Co. Constant Gigon Cooper & Fellows Courvoisier & Berthoud Courvoisier & Mathey Courvoisier & Wilcox Courvoisier & Wilcox Mfg. Co. Courvoisier, Wilcox & Co. Crescent Watch Case Co. Criterion Watch Case Co. Croce & Marchand Crosby & Mathewson Cross & Beguelin Crowell & Dunkerly D. Bournique D. Ornstein & Son, Inc. D.T. Warren & Co. David F. Conover & Co. David Louis Huguenin David Marx Dennison Watch Case Co. Denver Watch Case Co. Diel Watch Case Co. Dubois Watch Case Co. Ducret & Leichty Dueber Watch Case Mfg. Co. Duhme & Co. Durand & Carter Durand & Co. E. & J. Droz E. Imhauser Co. E. Tracy E. Tracy & Co. E.A. Jeanneret E.A. Muckle Eastern Watch Case Co. Edward Perret Elegant Watch Case Co. Elgin Giant Watch Case Co. Elgin Watch Case Co. Elless Watch Case Co. Emerson Watch Case Co. Empire Watch Case Co. Erie Watch Case Co. Essex Watch Case Co. Eugene F. Margot Eureka Golden Alloy Watch Case Co. Fahys Watch Case Co. Fellows & Co. Fellows & Shell Ferdinand Berthoud Fidelity Watch Case Co. Fitzgerald & Smith Fortenbach Bros. Francis Dubois & Co. Frank Doll G. Gigon Gale, Eaton & Snow George Courvoisier George L. Wait George W. Ladd Gigon & Co. Gigon & Co. (Alfred Humbert) Gigon & Seydel Gigon, Pequignet & Bro. Globe Watch Case Co. Goldsmiths Company of Canada, Ltd. Gruen National Watch Case Co. H. & J.F. Pitkin H. Gerlack H. Muhrs Sons H. Tissot & Co. H.A. Wadsworth & Co. H.W. Johns Manville Co. Hagstoz & Thorpe Harbor Watch Case Co., Inc. Harper & Co. Harper & McClelland Haydon W. Wheeler & Co. Henry Blank & Co. Henry E. Droz Henry Freund & Bro. Henry Goll & Co. Henry Lefort Henry May Hibbard G. Gill Howard Watch Case Co. I. Ollendorf Co. I.D. Watch Case Co. Illinois Watch Case Co. Imperial Jewelery Co. Invisible Joint Watch Case Co. Ira Goddard Isaac Swope & Co. J. Boss J. Laurent J. Laurent & Co. J. Muhr & Bro. J.A. Brown & Co. (G.W. Ladd) J.A. Simpson & Bro. J.B. Rosenblatt J.F. Courvoisier J.H. Flyer J.M. & S. Durand J.M. Harper J.P. Durfey Shiebler Co. J.R. Wood & Sons Jackay Jewelers, Inc. Jacob Macher Jacot & Courvoisier Jacot, Courvoisier & Co. James M. Durand James R. Bartlett Jeanneret & Co. Jeannot & Co. Jeannot & Shiebler Watch Case Co. John C. Dueber John G. Stuckert John Griffin John Henry John L. Ward John R. Proud John S. Warner John Sherwood John T. Mauran Mfg. Co. John W. Sherwood John Wanamaker Joseph A. Feiner Joseph Blitz Joseph Daving Joseph H. Bauer Joseph H. H. Penton Joseph Schulman Juergens & Andersen Julius & Guinand Favre Julius Favre Julius Racine Kasper & Esh, Inc. Katz & Ogush, Inc. Keller & Untermeyer Keller, Ettinger & Fink Kenosha Watch Case Co. Keystone Watch Case Co. Knickerbocker Watch Co. L. & A. Mathey L. Fritzche & Co. L. Herzog & Co. L. Lewitt & Co. Inc. Lachet, Louis Ladd Watch Case Co. Langdon Lapwell Watch Case Co. Leichty & Chabot Leichty & Co. Leichty & Deschamps Leichty & Le Bouba Lenox Watch Case Co. Leon Hirsch Leon Watch Case Co. Leonard Krowler & Son, Inc. Liberty Watch Case Co. Linden Watch Case Co. Lissauer & Co. Lissauer & Sondheim Louis Eugene Glatz Louis Gratz Louis Mathey Low & Courvoisier Lungren & Bell Luther Goddard M.W. Savage Manhattan Watch Co. Manheimer Watch Co. Margot Bros. Marsh Martin Metzger Martins & Tissot Master Watch Case Co. Mathey & Bro. Mathey Bros. & Mathez Max Freund Max Klaas Corp. May Pinnel & Co. Mayclese McCarty & Hurlburt Methuselah & Co. Metropolitan Watch Co. Metzger, Stein & Co. Michael H. Cronin Mindil, Brother & Co. Moffat & Co. Montgomery Safety Dial Co. Montreal Watch Case Co. Morris S. Rosenburg Muckle & Zesinger Mystic Watch Case Co. N.W.J.Co. National Watch Case Co. New England Watch Case & Jewelry Co. New Jersey Watch Case Co. New York Consolidated Case Co. New York Gold Watch Case Co. New York Watch Case Co. Newark Watch Case Co. Newport Watch Case Co. North American Watch Co. Northwestern Watch Case Co. O'hara Waltham Dial Co., Inc. Oliver & Davis Oppenheimer Brothers & Veith Otto Fessler & Co. Owen & Proud P.A. Giannini P.A. Jeanneret & Co. P.W. Ellis & Co. Ltd. Patek, Philippe & Co. Paul, Simon & Phillip Peerless Watch Case Co., Inc. Pennsylvania Watch Case Co., Inc. Penton, Ludlam & Underhill Pequignot & Bro. Perrin Watch Case Co. Peter Henry Peters & Boss Peters, Boss & Co. Pforzheimer, Dreyfus & Keller Pforzheimer, Keller & Co. Philadelphia Watch Case Co. Piguet Bros. Pinneli, May & Co. Pioneer Watch Case Co. Piquet Bros. Progress Watch Case Co. Providence Watch Case Co. Queen City Watch Case Co. R. S. Peters & Bro. R.R. Fogel & Co. Randolph Peters & Co. Rays Watch Case Co. Reese S. Peters Rex Watch Case Co. Richard Oliver & Bloomfield Robbins & Appleton Robert & Foster Rockford Watch Case Co. Rogers Rogers, Langdon & Went Rolex Watch Co. Roseman & Levy Rosenzweig Bros. Roseville Watch Case Co. Roy & Co. Roy Mfg. Co. Roy Watch Case Co. S. & D. Jewelery Mfg. Co., Inc. S. Andersen S. Bruner S.H.H. Penton Sag Harbor Watch Case Co. Schauweker-Chalmers Co. Schmidt & Leslie Schwab & Wuischpard Schwitter & Renaud Serex & Desmaison Serex & Maitre Bros Serex & Robert Shellcross Sipe & Sigler Sluka Bros. Smith & North Solidarity Watch Case Co. South Bend Watch Co. Spiro Watch Case Co., Inc. St. Louis Watch Case Co. Standard Watch Case Co. Standard Watch Case Co. Star Watch Case Co. Strauss & Neugass, Inc. Susstrong, Albert T. Zurbrugg & Co. T.B. Bynner Taylor & Baldwin The Canadian Watch Case Co. The Juldar Co. The Muhr Watch Case Co. Theophilus Zurbrugg Thiery & Serex Thiery Watch Case Co. Thistle Watch Case Co. Thomas C. Garrett Tracy & Baker Case Co. Tracy & Hulse Tracy & Shellcross Tracy & Ward Tracy, Baker & Co. Ulysse Savoye Union Watch Case Co. United States Watch Case Co. Unknown (B.W.B.&Co.) Unknown (C.W.S.) Unknown (F.&M.) Unknown (F.E.B.) Unknown (F.M.&Co.) Unknown (F.M.) Unknown (H.W.) Unknown (J.P.C.) Unknown (J.W.P. & Co.) Unknown (K.&B.) Unknown (K.B.&M.) Unknown (L.&M.K.) Unknown (S.&F.M.) Unknown Case Manufacturer Van Trump & Silver Victor Nivois W.F. Doll Mfg. Co. W.H. Fitzgerald W.J. Gardiner Watch Case Co. Ltd. W.T. Thompson Wachter Mfg. Co. Wadsworth Watch Case Co. Wait & Crocker Ward & Co. Ward & Jennings Warner & Keating Warren & Spadone Warren, Spadone & Co. Wendell & Co. Western Watch Case Co. Westphall & Sons Wheeler, Parsons & Co. Willemin Watch Case Co. William & Co. Warner William A. Guinand William Konovitz William McNeir William Vulcan & Co. William Warner Wilmarth & Bowman Wilmarth, Moffat & Curtis Wm. B. Warne & Co. Wm. I. Rosenfeld Wolf & Durringer Young & Co. Z. & G. Gigon

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Information Provided by PocketWatchDatabase.com:
https://new.pocketwatchdatabase.com/search/result/unknown/18506

Access Date: June 3, 2026

Unknown

The serial number 18506 is outside the known production ranges for Unknown.