dirty old mac

now this is just me be annoying really - cause I would never sell it but am curious to know how much people reckon NO's old mac SE would be worth? its one they used from the mid to late 80's & wrote technique on it including lyrics to a never heard song & even appeared on TOTP with them for fine time! i won it from radio 1 along with a card from the band with bernard writing "Keep computing...". enough gloating, any thoughts? does anyone else have similar stuff?