Here are two '51 convertibles that I consider having more attractive colors.
It's interesting to note the different rear bumpers and backup light arrangement on each car. The 1951 Buick brochures for both the US and Canada picture the backup lights integrated into the bumper guards, even the station wagon, same as the 1950 models.
The subject dark red convertible appears to have different rear bumper and it's backup lights attached to the body panel below the trunk. The rear emblem is located higher on the trunk lid than the others, with the lock below. Also, the subject car has what look like '60's Buick wheel center caps attached to the rear quarter panels...strange.
I still feel that CA$39,500. (US$28,726.) is optimistic, at least in the US.
...from the 1951 Buick sales brochure