Heuer, "Autavia Chronograph", Ref. 7863C. Circa 1960's. Fine, water-resistant, stainless steel wristwatch with round button chronograph, date and register. MH bezel
In 1968, Heuer redesigned the case used for the Autavia from a screw-back to a snap back compressor case.
This Autavia 30 Dato, which might be one of the rarest configuration of the compressor Autavia is in excellent condition with sharp faceted case, the bezel has started to slightly turn grey.