First, the 51...not as nice as the others, without any "51" notation on the barrel, in dark blue:

and the two pencils: neither have any noticeable markings on the outside. I think the red one is from the same set as the red fp in Garage Find, below:


Then, my mother-in-law wanted to know what all the fuss was about...and came out with this (I'll post it separately on the Shaeffer board:

It's short, a lady's pen -- she used it in graduate school in the late '40s, according to her memory.
The filler cap does seem to have worked itself off...

Enjoy! I'll have to figure out how to restore them...
