Back in the early days, there were actually 6 or 7 versions of cranks and up to a dozen prototypes:
1st gen - V1 19mm spindle - Side bolt spider mounting, Hollow spindle 1974-1975+
1st gen - V2 22.2mm spindle - Side bolt spider mounting, Full hollow spindle, No end cap, No safety washer key. 1976-1977+
1st gen - V3 22.2mm spindle - Side bolt spider mounting, welded safety end cap and safety washer. 1979-1980+
2nd gen - V1 22.2mm Spindle - TA Cyclotourist spider plate mounting. 1981-1985+
2nd gen - V2 22.2mm Spindle - TA Cyclotourist spider plate mounting. Safety Key washer non drive side. 1985-1990+
3rd gen - V1 22.2mm Spindle - 3 piece Hurricane arms, Tapered drive to TA Spider plate. 1992+
All dates are estimates based purely on original mechanical drawings,
documentation & sales figures/receipts coinciding with respective years!
I trust this information will now put you in good stead to know what is what.
And that's from a BULLSEYE Authorized Distributor!