I acquired this watch from my late grandfather's personal effects after he past. It was found with other watches and silver coins so I suspect he picked it up at a flea market or similar because it was gold. I don't think it was something he wore because he was a simple farm man. He only needed to know three times of day. Sun up, noon, and sun down. Plus I don't ever remember him wearing it. I reached out to an Accutron repair man in Illinois several years ago but never sent it off service. Plus I was worried I'd never get it back. I have done a little research but i would like to see what you all think.
There is a 1968 Advert page (color ad) on this site showing a Calendar "M" model in 18K that is very similar. Mine has the gold tone face and was found with no stap/band, but it has the same tuning forks applied to the 12, 6 and 9 o'clock positions. I have added a vintage original Bulova lizard strap/band in black with a 1/20 10kgf tuning fork buckle. I think it complements it nicely although it is short for my wrist (buckles on last hole tightly). I would be interested in a strap trade if someone had a longer original similar to this one or one that was more appropriate for this model. 
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