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Pretty sure it is a Corsa Extra.
@WimVDD: the Hitachi frame and the Corsa-01 were just on the list to show that the seat stay construction was not uncommon.
Fatbiker
@SWijland thanks for helping

As is possible see in this photo, the dropouts are stamped Brev Campagnolo so it's a Corsa Extra? The top of seat stays is like the Corsa-01 without stamping.