Worth a tenner, max, but tell you what, as I'm feeling generous, and seeing as it is 'be nice to people whose guns have shiney patches due to sporting soldered-on scope rails at some time' (lol ), I'll give you £15 for it (posted, naturally, ) ...
In all seriousness, it's probably worth the thick end of £2,250 (but I may very well be over egging the pudding due to my love of these ). Will read other comments and guesstimates, with interest, as they appear. Atb: G.