farthing might have gone from UK in 1956, but in ireland, they lingered..

as for noble's angel's and mark's, i have only read about them in historical novels...

another '12th' cycle are the tides, that move by rules of '12th's' --i always forget exactly how, but the volume of water that 'moves' increases by 12ths (1/12, 2/12, 3/12, 6/12th, is the progression, i think-- (and the reversed, 6/12th, 3/12th,..)