TankerSpec Collection / Serial #21230020 Waltham Grade No. 620 Serial #21230020 Movement Image Dial Image Case Image Manufacturer Waltham Grade No. 620 Serial Number 21230020 Size 16s Model 1908 Jewel Count 15 Setting Pendant Finish Nickel Case Material Base Metal Case Manufacturer Illinois Watch Case Co. Case Grade/Model Spartan Case Serial # 0517656 Dial Material Enamel Dial Type Singlesunk Dial Style Roman Dial Signing Name Illinois Watch Co.