Very nice! It's an early "All-Guard", or "pre" All-Guard. The later ones had that on the dial, as well as the case back. High-quality throughout, and it appears to be in very good, original condition.
The eccentric date window, compressed towards the inside, is not to everyone's liking, but I've always liked them. IWC, to name one manufacturer, also produced automatics in that style.
I owned one like yours, but cannot recall the reference number off the top of my head.
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