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I've been knee deep in my 915 transmission rebuild for the last couple of months and that looks exactly like my 1983 911 SC 5-speed tranny which is 915/63. Mine also says 74D with serial #0634. Too bad yours is ground off. Hopefully, it didn't happen in an accident.
Yours has the magnetic speed sensor, like mine, so I would say about the same age as mine. I believe there is a date code box cast into my center section of the housing on the side with the big removable cover (on the upper side). As someone else said, check diameter of the hubs to help pin it down further.
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