Both nice, but wouldn't we be talking '60s for the one in the 2444-based case? That watch is a child of the (early) 60s, so I would put this one in the same timeframe, making the watches more or less book-end the decade. I'd expect a 50s watch to be in the 2443 case that preceded this one, at least by the late 50s - at the start of the decade they were probably still using the (original, non-Carrera) 2447 case.