Interesting post.. I have an early Summit, groupset datecode June '91. It has the classic Raleigh seat-tube cluster, not the shot-in stays of yours. The mangletastic bottom bracket (and the rust) are a tad worrysome, otherwise I'd be interested. The effective seat tube length is about two inches longer, and the headtube on mine measures four and a quarter inches- yours looks longer.. GLWS anyway.