Fellow Correspondents: I am getting a kick out of this discussion. Just read the follow up by MacMullen. It is true that with the one design classes most of them do assign numbers apart from USSailing, not all. Just received the 1999 DRYA Valid List (Yachts with assigned racing ratings that are current). 220 yachts are registered. Of that number 153 are five digit numbers assigned by USSailing or predessor USYRU. The prominent one design classes by and large use the numbers assigned by USS:J120's,J35's,C&C41's,NA40's,Catalina 38's Thomas 35's, Tartan 10's, Santana 35's. Those using class numbers are Etchells, Express 27's, Cal 25's and Crescents. One Morgan used the hull number 6846 a Charley 41, built in 68, hull number 46. The rest of the Morgans in the fleet use USS numbers. It appears that one design classes that are spread out over the country use numbers assigned directly by USS and carry numbers like US 35999, a Mumm 36, Tripp 50's etc. It is also true that if a guy wants to use his hull number or a special number he may be able if there is no conflict. Last of all, Regulation 14.1 of DRYA says:" All yachts competing in DRYA sanctioned regattas under handicap or meassurement rules must display US Sailing sail numbers to be assured of their finishing times being taken." I have srved on the PHRF C and D class committees several times and that is the way we do it in Detroit. No comment about US Sailing.