[Milsurplus] Unknown "DF" Mechanical Filter

[Hubert Miller]

Anyone here know about a mechanical filter, blue color finish, 2 screw mounting with 3 pins at each end, similar size to small Collins,
with "DF" logo in circle, and this number on it:  No internet info found !

TYPE D.F-455-U-2.3-H      ( may be DF or D.F. )
P/N  7232-528-3

After today's hamfest, I decided I should hamfest at my storage, and I found this and 2 new boxed Collins 455 2.1 filters. Hmmm.....
I had no idea I owned these!
thanks-
Hue Miller
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