Takara made it's debut for the 1974 model year, so it's no older than that. Most of the early Takara were manufactured by Kuwahara. The dropout style and pillbox cable stops are consistent with the boom era Kuwahara product. The exact composition of the Kuwahara serial number format during this period is unknown but it appears that the first number may represent the year. If so, it would be a 1974 model manufactured in late 1973. For further confirmation, please report the date codes on the crankarms, which appear to be OEM.