The two i had a choice of buying were in good original nick, but probably not as nice as yours. But even the FWB 127 I picked up was £150 and that was in very good condition and subsequent BSA Airsporter S was £120 and thats was in great condition didn't need much doing to it at all. Prices seem a little lower at the mo than usual.
Maybe worth keep it and enjoying her but I'm sure you'll get what you want for it eventually. I'm hopefully of to the Bisley gun fair with out the wife to spend some hard earned.
But it was only a rough guide to an average 45 the more work the more money .
ATB
Paul