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It depends how period correct @SasenFrAsen you want to be ?
I think your frame probably had a flat fork crown and no Somec inscription, this might help you find something as it will be easier to find a "plain" fork than anything with a Somec logo on it.
ArthurDent-
Yeah, as @ArthurDent pointed out, all depends on the desired originality (and your pocket). I assumed with the faded paint of the later models that can be ruled out already, but that doesn't mean your bike won't look cool. Actually, I think yours had flat top with logo, just like mine, since it has the tulip lug cutouts, meaning in its time it was no lesser model (actually in the really early stages the lesser models meant lower cat. gruppo and simpler paintjob, you can search for SOMEC Special and Supercorsa to see the difference.) I can post you a pic of my fork later if you need for reference
Lattz
Make sure to have some cardiovascular medication at hand... they are no cheapo, get ready to pay more than what you paid for the frame and fork.
Here's an example from Cicli Berlinetta in Germany. Nice and coolb but I would avoid these big name shops, or at least in cases, like this. The fork is magic - although its Gipiemme dropout - if you anyway go for a more modern look its okay for yours - although not the original style for your frame. But the price.... eh....