Thought on this 30L?

U ulackfocus

That's a late 60's watch, probably 1968 if I read the serial number correct, and might be an original dial. We've debated how long Longines used only applied metal winged hourglass logos before, and the later into the 60's a watch got, the more possible it could be to have an inked logo. However, most of us prefer an earlier version of that watch that uses the applied metal logo on the dial. You can find very nice reference 8888's out there in stainless with the 30L for decent prices still.