QT-77 quartz tester.
I gather if there is not variable trimmer adjustment you really cannot do much to adjust the watch. I have seen where some movement allow you to do a one time adjustment for plus or minus but would have to read up on that a bit more.So, you have an older, discontinued, quartz movement watch. It's running fast/slow. There is no adjustment, and, you can test that it's off. Where do you go from there?