Yeah, that's what I was referring to, who knows?
The "RIC" is invariably followed by three characters. Most often a "1" or a "2" followed by two letters. In combo they may be a date code, indicate something about the cone (like "bass" vs. "lead"), or both, or ? I can tell you that Celestion and Duncan Boniface say they don't have any clues, and I don't think Jim Elyea does either about this but maybe he's just not talkin'!.
For awhile I thought that possibly 1 = 55hz res and 2 =75, since Celestion specs make this distinction, "2" often appears on "lead" models, but it doesn't hold up across all examples.
Then you have "L" instead of "1" or "2" on some like the one above.I've wondered if it could be a bad stamper for "1", but sure looks like "L"!
If any of you codebreakers are interested, some authentic "RIC 1" codes spotted on Celestions from '60s and '70s include: TD, SF, AU, HW, JA, WB, SL, KB, VV, DA, YI, and JC. Some "RIC 2" codes include: RJ, RM, RN, SA, and RO. Plus LDV and LJY as above . . .