Some bearings used to have a marking system to show the tolerance when it was assembled.
Probably assembled, then it was checked for 'play' and given a mark to indicate the tolerance.
From memory it was a O, OO or OOO almost polished on rather than stamped earlier in production.
I'll have to try and google the details but maybe this is a tolerance mark ?
Colin
'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
'58 Series II (sold)
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C
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