Hi,
I have seen this frame L - 8 (or 6?)X - C6440. So if I followed correctly, it should be a Corsa Extra in SLX made somewhere in 1990... Am I right

? Also, the seller claims that the seat tube is 56ct. I asked him to re-confirm the measurements.
Thanks for letting me know if I'm right or wrong.
edits: finally, the guy got back to me. it’s a 5. Top tube is 55 cc.