The fork crown looks right, but Miyata's usually have the spooned top of the seatstay. It would be a pretty good bang around bike if you don't have one. It's stacked with brazes for any kind of rack or fender. I agree that the fork is easily fixed, maybe cheaper than $85 (I know a guy who does it for less - not a framebuilder but a skilled welder who knows more about bikes than a lot of framebuilders.) This might be a something like a Shogun or nice Nishiki?