Hi Neal:
I am curious what size these are. If they are 2 3/4" x 4 1/2" indeed they are from the Safe Driving set.
If however they are 3 1/4" x 5 1/2" they are Phillies team issued postcards which used the same images as the Safe Driving set.
Looking at your scans I THINK they are the postcards.
The Safe Driving set does come with blank backs, but they are seldom seen that way as you referenced, while the PC's only come blank backed. There is differences in the paper between the two as well.
Fred
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