QUOTE (Otter1 @ Sep 30 2008, 12:13 PM)

Hi,
I've picked up a few Vacumatics over the last year, mostly from the 1940s, and 2 of the 5 have letters on the back of the feeds, while the other 3 do not. So, what does that letter signify? Does it have something to do with the two-tone nibs that both pens have (assuming they are original)?
The two pens that have an A or B on the back of the feed are:
Vac Debutante, blue diamond, 1942, 2-tone nib, feed has an A on the back
Vac Junior, 1947, 2-tone nib, feed has a B on the back
Thanks,
-Randy
Conventional Wisdom (such as it is) suggests the code has to do with flow characteristics. W actually is known (i have papers somewhere) to indicate wide channel feed and crops up on broad, stub, flex nibs. "A" associates with quite fine points. Have seen i think some "V" out there too.
TBOMK, no one has taken a bunch of found-in-the-wild pens, pulled the nibs to correlate nib grade/flex to feed codes.
I know of no correlation to two tone effect for the feed codes. I have not researched whether the codes ceased after a certain year.
regards
david