S2 7.9 Meter Class Association

What's the typical sail # convention for 7.9s?

The other class I race it's generally matched with hull number, but I recently purchased 7.9 278 from Canada and sail number is something like "BC6"... I'm up in the PNW so not likely to get into any class racing, but figure when I replace\update the sails I'd snap to what's the most typical used.

Later
C

If Phrf typically its you us sailing registration no. Which tgat is more rare these days.

If not its typically your hull number, after all if in OD racing tgat would make it a unique number.