As for your first question "other then the regular F and M nibs what other nibs did Sheaffer made for the Snorkel "
Jim did not answer it in his post above, but he has the answer elsewhere, so I will quote:
QUOTE
Breaking The Code
The 1953 Sheaffer Catalog lists the following sixteen gold Triumph points. Each is listed below with their corresponding codes from the table above.
Fine - F5
Extra Fine - X5
Flexible Fine - FF5
Flexible Extra Fine - FX5
Medium - M5
Flexible Medium - FM5
Accountant - A5
Shorthand - G5
Coarse (Broad) - B5
Flexible Coarse (Broad) - FB5
Stub - S5
Broad Stub
Left Oblique Stub - S5L
Flexible Left Oblique Stub
Flexible Stub - FS5
Music
Having no marked example of a Flexible Left Oblique Stub, it's a good guess that the coding would be FS5L, but I'll wait until I see one. The same goes for the Broad Stub, which might be a BS5 or an SB5, using "core" codes as a prefix. If there is a medium or fine Stub, though not listed, it would seem logical that it would follow the same pattern. As stated above, since I don't have a marked Music nib, I don't know what, if any code was used.
From
Sheaffer Snorkel Era Nib Codes 1952-1958, by Jim Mamoulides 9/11/03 at Penhero.com.
I would add an interesting side-note, that relates to the nib-codes if not to Snorkels. I have, in my pocket, a Sheaffer Cartridge Pen with a steel triumph nib marked "F8" on the backside. I assume that F is for fine, and 8 for steel triumph nib. Are there any other nib-codes outside of the Snorkel line?
John