The price for the two Model 6 pistols can vary a lot with the condition, and if they have the one piece plastic grip, but without any pictures it is difficult to be too accurate about the prices, but given your description I would guess at about £50 - £100 each at very best.
An almost mint and boxed later model 6G with anatomical grips sold here for £150 a couple of weeks ago. This pistol also had the wooden anatomcal grips as well as the original moulded plastic grip and the instruction leaflet and can be seen on www.bobsairguns.com . click on pistol/spring powered/model6G to see some pictures of this actual pistol - clicking on any picture give a full screen view.
Given this I think maybe the prices I quoted above are on the high side.
The FWB Model 90 is a pistol I have been tempted to buy many times over the years, but the electronic trigger has been known to be troublesome and although some are still working perfectly - others are not and are either difficult/expensive or impossible to get fixed.
If yours is working well, and not in A1 condition ( but with handbook) I would guess at £250 as being a fair price - but given the unpopularity of the pistol when new and that there are not so many left that are still working well - to the right buyer it could fetch more.......again some pictures would help greatly in giving a better price guide.
The grip modification needs to be seen, but if when removed the original grip is left damaged in any way, it would reduce the value as new grips for these are getting impossible to find and will reduce the value significantly to between £100 and £150 - and thats only if you can find a buyer who wants to shoot it and does not mind a damaged grip rather than a collector who would probably not be so keen to buy it at all.
Last edited by zooma; 30-08-2012 at 12:24 PM.
Rossendale Target Shooting Club. Every Tuesday and Thursday evening 7 - 10pm.