I can't tell from the pic provided, but this could contain a 994 movement. the 99x series was the last in-house auto movement Longines produced. The bottom of the dial should have a 994 SWISS xxxx (model number). Automatic with date function and no second hand is appropriate for a 994 (the other 99x had variations of hands/date, etc). The dial would be appropriate for the late 70's, early 80's as well. This is a quality movement, and if you like the look of the watch, the movement is solid and I would vote to service and enjoy it. Any good watchmaker should be able to open the case and confirm, if you aren't able or comfortable doing so (no shame in that - some of my watches only get opened by my watchmaker).
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