I was very excited to finally get one of these rather uncommon Waltham wrist watches. It seems military in style, but the protective device for the crown does not really seem very practical for rough use. If you can’t tell, the bow holds the crown down so it cannot be pulled out accidentally. The case is also kind of a hermetic design. The 6/0 (Jewel Series) movement is fixed in a ring that also holds the crystal, and the entire assembly is installed from the rear and protected with a threaded-on back, so it is just a two-piece case. So far I have only seen eight different examples of this model, and that includes the one shown in the Price Guide. Five are in solid gold and three are in silver cases with some gold elements to them. My biggest personal quest with these is to figure out who made these unsigned cases. Most are just marked “PATENT PEND.” and a 4-digit serial number, plus the gold or silver marking. I would also love to work out when these were made. Does anyone else have one of these?