I recently inherited a .177 air gun marked GECO Mod 27 and have been told that its a Diana the tiny markings on the barrel next to the Made in Germany stamp read 01 76 which I understand to be Jan of 1976, the serial # is 001. There is also an F stamped in a pentagon. The gun is in great condition not a scratch with really nice bluing.
Can anyone give me more info on using the gun? What should I insure it for?