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Nope that's a clamp on. Oh well.

This Tsunoda has stops as well. I believe the model is out there 🤷‍♂️

I hear ya. Possibly from the maker which I believe was Araya / Tsunoda. Unfortunately no steerer markings. Same seat stays to seat tube clamp. The search goes on.

Yes the cable stop is different. It is meant to pair with the Shimano barend shifters that were on it. I was thinking a tri/time trial version. High end for its time with the tig welded portions during the late 70s to early 80s. It is very light. Period parts of 1st Gen Dura Ace. Serial number...

Well, that's part of the issue. I don't know the answer to that. The bike was acquired as you see it.

I have what appears to be a Shimano aero bike frame with true aero seatpost. Similar ones were made by Araya incorporating Tsonuda designs maybe more. It had first generation Dura Ace installed so dates around late 70s to early 80s. I just can't find exact model or brand

Need help identifying this 1960ish track frame? Lugs have a small circle cutout. Bottom bracket is English threaded. Seat clamp lug bolt is inserted on left non-drive side into a threaded drive side of the lug. The fork crown is a twin plate design. And the bb shell has three slot cutouts.