I wonder if you can help me date and appraise my Gazelle Trim Trophy. I got it on ebay for about £30 ($50) and I know I got a bargain, but I'd like to know more about it. It's 531, with nice lugs, Shimano 105 rear mech, Shimano Exage 300 Ex at the front. Weinmann centrepulls, but with aero levers which I'm sure aren't original. 700 x 20 wheels (eek!). It's all in good nick, but could do with a clean. The number on the BB is 3299051. Can anyone help me with age and approx value, and anything else interesting (where did it fit in the range etc)? Pics on the link below, and thanks in advance......