1950s Croton Aquamatic just back from WM for clean up and service. I admit, I bought it for the stylized numerals. A number of these Aquamatics have found their way into my collection. I have found these automatics to be nearly indestructible and very accurate timekeepers. This one is all stainless steel with a screw down back, 33mm diameter, 41mm lug-to-lug, 18mm strap.