It's a Sport bike. I have wanted one since I was outbid 5 years ago. They are really cool.

That said, one from the 50s will run 200-300 euro. A new one like in your listing (likely 60s) will go for 120-180 euro. Then it will cost 200 euro to ship from Italy. The $600 he's asking is a bit high but not too far out.

This is the one I lost.