swift240 wrote:
No wrong it was 30 million units sold.
No. There are several guesses about how much 64s were ever produced. The lowest guess is indeed 17 million, the highest is 30 million, but the latter is almost certainly not correct for the C64 alone and most likely includes all C128s ever produced (about 7 million, if I am not mistaken).
Now for C64s in display in the TS: they are indeed the original (breadbox) model and the newer C64C. They _can_ have different motherboards, but this is not necessarily so. The C64 has seen several different motherboardrevisions and the C64C was also delivered with exactly the same motherboard as its predecessor in the brown breadbox. The switch to the newer SID-chip was made in a later motherboardrevision. You can only be sure of what type of motherboard you have by opening up your 64.
As has been mentioned before: both these models of the 64 are neither rare nor valuable (in terms of money). They are still great fun, though. I enjoy my C64C to this very day.
