The V2 *designation* came out quite recently, with the last 3-4 months I think. Other than what it says on the plate, though, it seems the design and fittings changes took place gradually over a number of years.
In the case of the M80, it sounds like the speaker arrangement was changed first (from TMTMWW to TTMMWW, years ago), then the crossover, then the binding posts, but don't take that as gospel truth.
M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8
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