Hi don't know to much about the Gamo Centre apart from it's an Underlever spring pistol, it began production in 1974 and ran until 1991, it was also sold in the USA but as the Daisy "Target Pistol 62" It also has a nice tilt feature on the grip. And that about it from me, Price i would guess around £80 ball park and i'm happy to be corrected.
atvb
Jason