I got this very nice Gruen diver with the desirable orange dial and bakelite bezel insert. The watch is in all original condition. I have another one with a dark blue dial but without the date function. I know this case was used on the Zodiac Super Sea Wolf, Blancpain Fifty Fathoms,Juvenia, Royce, Edox, Luxor dive watches (among others) from the same era. It is a large watch at 43mm without the crown. My other Gruen with black dial and no-date function.