Yes it is fine. I think Rolex stopped stamping the case backs in the early 1970's
Here is an example from HQ Milton showing a 1973 6694 with no date stamped on inside of case back
https://www.hqmilton.com/timepieces/rom28m0k/1973-rolex-oysterdate-6694-silver-dial-A2840
Nobody was faking 6694s, that was one of the lowest priced Rolexes on the market. A manual wind watch with a crown needing to be screwed and unscrewed to wind is not really sought after now ether. Most sell for $1200-$2000. I paid under $1000 for my 6694
Yep, i saw that thanks - but my point was i couldnt find a CRS stamped case back for the ref 6694 for any time period - 1969 to 1980s
Nobody was faking 6694s, that was one of the lowest priced Rolexes on the market.