Dating Letter for a CT1 Yamaha

[RICH MORGAN]

I thanks for the membership I have a CT1 I think it’s a 1969 how do I go about getting a dating letter any help would be appreciated all the best Rich

[blackhat250]

I would  join or ask on the Aircooled RD  forum,  thay have a dating member ,,see on this site ,  http://www.aircooledrdclub.com/smf/index.php?board=42.0 

AND  see  this thread,  thers a back  log , https://yamahadtclub.proboards.com/thread/3766/last?page=1&scrollTo=20569