The 'A' means it was the first of that design [watercooled 600cc ] and the '1' means the first year of that design.
Next design of that 600cc type would be 'B' then the third would be 'C' and so on, each letter code then has a number from 1 to ? for each model year of that type. I think Kawasaki are now up to a 'P' for their 600cc sports models.
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