Re: Help!! Is this an Orange??
It might be an Orange E2. This is a guess rather than knowledge. The E3 started in 1995 possibly mid 1995. Your is dated April 1995. It may be a race frame for a rider rather than a stock frame. You could try calling Orange, but when I called about the seat tube collar size for an E2, the guy said "Oh, Crikey", so I guess that sort of information is not available to the current staff there.
General comment: Does anyone know if any history of Orange bikes and frames pre 1998 has been compiled or attempted?