Speaking as a previous owner of the latter $5 note, I can say that it grades Fine front and back. Grading of circulated 1935 $2 and $5 notes must take into account the appearance, and that note has a lot of original colour on the back. Many 35s lose colour along the principal fold lines, and that hinders appearance. Yours looks fine (no pun intended). Pinholes are normal for a note of that condition.
What explanation. All you said was it has original color. There is your post above.
It says......
1. You owned the note
2. You said your opinion was fine, front and back
3. The note has original color.........( 10% or 50%?or 2%or63%who knows)
4. Then went on to describe how( " MANY 35's " ) lose color along fold lines
The back of that note looks considerably worse than the front. You concede the front is FINE.
It looks like the back is about to split and may have been crumpled into ball and put into
a waste paper basket. The poster asked for an opinion and I gave him mine. If I were buying that note I would not consider it more than a VG. You can call it a VF if you want. If you wanna buy fines that look like that, BE MY GUEST