I have an identical one of these that I used to win the MPL postal series with when a .22 event was run some time ago.
It was by far the best choice of target pistol that I could find in the .22 calibre to use in this competition, and I still have mine hoping another .22 target event for MPL air pistols will be arranged in the future.
I always wanted to find a .177 version with the grey plastic grip and a Model 6 recoilless type with the grey plastic grips too - but have never found either of them.
Good luck with your sale - they are nice pistols - and the grey plastic versions make a nice change to the slightly later vintage brown plastic grips that are seen more often.
Bob.
Rossendale Target Shooting Club. Every Tuesday and Thursday evening 7 - 10pm.