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This is indeed unusual. The only watch I find in the 1977 linebooks that is a partial match is the one shown below. It appears to me based on the unusual cutout for date window and the overlap of the indices into the current open center, that this is a match.

I am guessing that your watch had the dial removed and perhaps the day wheel. Either that, or the movement is a replacement with only a date complication.

1977 Accutron Date & Day 21542-6W w/Spaceview modification