Three years ago I was posting on What’s in a Letter. This post covered the sometimes confusing letter designations used by the collecting community.
A – Arrowhead Shaped Patch
J – Jacket Patch a larger patch of varying shapes to be worn on a jacket
R – Round Patch, typically 4 inches in diameter or less.
X – Odd Shaped Patch, any shape not described above.
P – A Blue Book addition for any patch which looks like a wedge of pie, typically for triangular patches worn on neckerchief.
F – Flap shaped patch
See the original post for more letters, be sure to read Roy Weatherbee’s comment as well.
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