Chris, my list says 49 was never built. sail # used by #23--Bettahad, broken up in Yarmouth in 1970 (a famous boat owned by a famous W Sr skipper, Ross Richards, of PRov RI; he won a ton of races, and some notoriety for a famous bad temper on the start line).
You may kno more than i, from the sound of it--just thot i'd chip in....