Amazing Vintage and Collectable Rolex Oyster Perpetual Chronometer watch. This 1940's Vintage Rolex watch Oyster Perpetual Bubbleback Chronometer is a SS watch model Ref 2940. The case measure approx 32mm, its an average size mens watch. The winding crown is orginal, dial is orginal, The strap is a non-Rolex band leather strap. The watch hasnt been polished, respecting its vintageness but can be upon winners request. Runs great!