Baseline photography for this 1971 Triumph Bonneville restoration project:
According to Low Brow Customs, this means I've got an A (January) E (October 1970 - July 1971) and was the 9125th 650 twin made that year (00100 is the starting number for each grouping so this was the 9225-100th motor made in the 1970-71 batch).
The frame was tricky to pick out - one of those sites mentions that the stampings are sometime very thin and this one's barely there - our best guess is AE07050, which would put it in the same month/year as the motor, which seems promising.
The chopper stuff has started to come off and the bike is up on a wooden base on the stand in the back of the shop.
Next up will be taking the tank off and beginning the GREAT DISMANTLE OF 2021!