Can someone tell me what the appeal is for Mafac Top 63 brakes in that they always seem to sell on eBay in excess of £200 sterling, (check out eBay item 729361116) Whilst I can appreciate the difference in design of the adjustable backplate on the stirrups what is it about them that commands a substantially higher premium when auctioned, over other favourites say the Mafac "Racer's"? Is it their scarcity because they seem to turn up regularly on eBay. When I first attempted to put a serious racing bike together back in the 60's I was offered, and somewhat reluctantly accepted, Top 63's because my first choice for "Racer's" meant having to wait a further month because of the shop then currently being out of stock, I don't recall them being much different in price and although I found the Top 63's to be adequate their design and braking efficiency didn't seem to be any superior to the "Racer's"(........always wished I had waited that month longer so my bike could mirror those seen in the peleton, all the main trade teams seem to use the "Racer's") any comments anyone? Griff King-Spooner (London UK)