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While it's anyone's guess how many of those 5500 were Champ II and how many were Bassman 20, they seem to come up on e Bay equally often. People keep on referring to this 'fewer than 500' thing, especially when they're trying to sell one as 'rare', but I'm still waiting for anyone to point back to the original 'fact' of the matter!
Then Soren in Denmark started showing serial numbers on his excellent Super Champ website (which is no longer on the web) - some of those numbers fell in between some of 'my' PRII numbers.
If you've got one of the 14 amp models in this range you can get a rough idea of its date-of-manufacture from these tables.