If the model number includes the letters PC e.g. BGA PC AG then it is a phase corrected version - the 'original' BGA was not. Model number for the BGA 10x42 was 30302, for 10x42 BGA PC it was 30316.
We don't have an electronic copy of a catalogue containing the non-PC version - the earliest is 1999 when the PC model was already available. Our stock system was converted in that same year so prior launch dates rely on the (increasingly) dim and distant memory of the business owners!
Cheers, Pete