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@DavidR1531
It looks as if you really found a very interesting bike here. I have a Corsa Extra which is marked with an F - 1996. I also have the same fork on my frame which is also stamped F. Inside the fork there is also a sticker which has the same number as the frame. I will add a picture soon. The forkcrown is rounded as you will see. I believe the earlier forks had flat fork crowns. I don't pretend to be an expert but thought you may find this useful in some way.