There are two different autoweight finish common on these 1140's, from what I can see mostly looks good. The scratched in markings in caseback looks like a hack has been working on it, crown and pusher changed, lot of use over the years and of course if not in good working condition could be expensive to complete, I would expect this is at bargain price given condition. One thing that does concern me a little so the auto wind section is slightly different color to main movement would need to strip and examine the watch to be sure this may have simply been a replacement part/module. its very old had lots of use so it is what it is now! main movement I think should be 2890 PS think I can see the "omega" in crystal center
The stamp will read ETA, is the watch running, all chrono function working correctly, pushers tight, I see them for sale nice examples $1000 to $2000, this I would say is a watch to use and enjoy once serviced and repaired, given condition would be hard to sell as many other better examples out there.
wow did I make a typo, yes 1140, Given the replaced pusher, crown, questionable auto-weight, sticking pushers, extensive service required, no Omega metal band, you would be ill-advised to pay more than $600 for this in current condition.
A quick look shows for $1500ish a far better examples sold, there is one looks new with box and papers two tone band $2k