Was the Ferrari 625 car number one?
If you look at the checklist about five posts up, you'll see the missing one.
Neilshouse identified it as a 553 (which it isn't)
The two 500s (1 and 6) seem to me identical, but the photos were from the years in question, just in case I'd missed a subtle change.
You got the catch question (1957 when there were two drivers) and the non-obvious one which we are debating in this post (one of the two GPs in 1954 not won by Fangio and one of the two won by Ferrari).
I think 9 points in total, 7 to neilshouse and two to pieter
I think we'll call this solved now.
Watch this space!