It's a 23" frame(=58 1/2 aprox.) a nominal size.27' wheels those bikes in 82-84 measured fractionally.Nice bike,seems like a good deal.I don't see the 600 Shimano,perhaps the rear DER. The SR cranks were ussually grouped with Suntour,Sugino with 600,oh well,Univegas had different set-ups.Could be later,it doesn't matter,bikes lived for years in warehouses back then.It's a Miyata.The clincher is the strange saddle attachment,other aspects as well.A GOOD bike if the pic's true.Looks like a 710ish frame.