You showing it off, asking a question, GTG, or....? Looks attractive. The pictures are clearly highlighting the toning (such that the surfaces, and the actual quality of the coin, are very hard to interpret from these pics). 58's are known for their attractive toning. I'd WAG a 65, no FBL, based on the pictures. Nice coin.
No FBL. That's a hot one. There's no nothing there but an outline of the bell. Yeah, I'd like to see what it looks like, too. You know, a photograph. From these images, it pretty much held its shape, and the color is VERY nice.
Since we are on the subject, and since there is no agenda: 57 and 58 Franklins are known for their remarkable toning. I've owned many of them, over the years. Here are some: This one I still own. It is graded 66*FBL by NGC. In hand, the toning is electrifying, and jumps off the coin:
The key to lighting Franklins is to not overlight them (as your pictures are). There needs to be a bit of contrast, to show the relief. Try adjusting the lights (especially the reverse) to the 12 o'clock position: for a Franklin, the bell lines are key. Only certain lighting angles will show the bell lines, and you want to take advantage of that (through use of contrast/shadows).
Yes, that is the leading theory. All of the best toners come directly from mint packaging (although, no one knows what it is about the mint packaging that made them so good). In the early 50's, mint set toning is often colorful, but usually more speckled and not as rainbow. In 55 and 56, it started getting better - but 57 and 58 are the best. For this reason, original mint sets from 57 and 58 (especially 58) trade for a large premium. However, the mere presence of a mint set alone doesn't guarantee good toners - I've seen plenty that were dark, mottled, and unattractive.
Two more before bedtime (for those of you just joining us, all the same coin, just with different lighting positions.) Definitely would agree with the NO on the FBL.
Nice P mint Franklin! My best guess is that it is an album toner. The Pi man's Frankies are almost certainly Mint Set toners.
Probably album toning but there is a private "mint set" with the coins set in white cardboard that produces this color as well.