Hello, while I was trying to find a vintage Omega I have discovered this Longines. This has automatic L 990.01 movement and its serial is 54617678 (I guess belongs to 1980's). The price is nearly 300 Euros. I am posting the photos and details below and kindly ask your help in order to identify whether it is original and worthy...

P.S I still want to buy a vintage Omega instead of Longines however, these days finding a clean Omega is very challenging.

http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&Longines_990_1