Been a long time since I had my Team Marin, but that looks to be an early 90's frame to me.
That's a 21'' by the looks? I had a 19'' and remember that it had a 23.5'' top tube and felt 'roomy'. What ever year It's going to ride nicely. Are you going to keep it period correct then?
Hell no! I don't actually ride a bicycle.
'93 J.P Morgen, '93 KHS Montana Team FXT, '95 Pascal Blanc Explosiv, '95 Softride Contour Powercurve '92 Trek 9200, '96 Barracuda Tia 'hot rod', '89 Muddy Fox Courier Comp, '99 Sunn Exact Disc (Projects) '89 Haro Extreme, '89 Haro Extreme Ti, '89 Rudge bi-frame, '91 Carrera Katmandu, '95 Kawasaki KMB 450, Ferraroli California Performance, 50's Rudge 'hot rod', '85 Schwinn Cimarron. '89 Laiti Mono.