The watch definitely looks like a March 77 rather than March 87, It has the Suwa symbol and pronounced bevel edges on the date, both the features are on watches around 1980 or earlier.
I would get someone like Duncan to restore this, that Patina on the dial is lovely and it will be a very desirable watch when restored, albeit you won't want to let it go.
I think the genuine strap for this is the Seiko GL-831, however I think they are scarce and can be pricy, if you want a similar strap for everyday wear WatchGecko do a Bonetto Cinturini strap which is a good impression of the GL-831.
https://www.watchgecko.com/bonetto-c...atch-strap.php
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