Very difficult to gauge in some ways, but here goes. Last August I sold a standard .177 HW35 in vgc for £135, and a standard .22 for £125. I also sold my vgc HW35TH .177 when went skint earlier this year, and that went for bang on £200.
Based on all this, for your factory spec TH stock "only" then, if it is in good "original" condition (no chips to lacquer, dinks, or lumps out the original butt pad), it has to be worth a minimum of £60, and personally, I would not take a penny less . Hope this helps. Atb: G.
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Done my bit for the BBS: http://www.airgunbbs.com/showthread....-being-a-mod-… now I’m a game-keeper turned poacher.