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You can't really tell butting with the tapping thing. At least I never could and I tried. Especially with a lugged frame.
It looks remarkably unremarkable to me. My guess would be Japanese frame but it could be European. The SR and Suntour parts indicate Japanese to me. I'm willing to bet they are not Campy dropouts on the frame. The fairly wide 5-speed cluster indicates a "sport" type bike (as opposed to "racing"), but it also doesn't have some of the huge rakes seen on forks from that era.
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