I paid £175 for my (1975 IIRC) Model 66, which was advertised for sale on this BBS.

Sold in perfect working order, complete with sights and barrel sleeve, and a heavy 'flight case' type box.

Cosmetically challenged though, bluing worn on the shroud, and moderately dotted with pitting on top of the cylinder, which is a shame.

I agree with prices as said above - You can get well used but not abused FWB 300 for £300 or a bit less, Diana '75 traditionally for a bit less than the FWB, so I think that limits a well used '66 to the £200 mark.

HTH