What the eff?

"F" stands for der Fotograf
"M" stands for Messsucher

and in another life...

U (Uns) for 1 element
B (Bini) for 2 elements
T (Tres) for 3 elements
Q (Quatour) for 4 elements
P (Pente) for 5 elements
H (Hex) for 6 elements
S (Septem) for 7 elements
0 (Octo) for 8 elements
N (Novem) for 9 elements
D (Decem) for 10 elements
 
With the Praktina FX, F meant focal plane (flash sync for focal plane bulb) and X meant electronic flash.

Perhaps "F" is for focal plane shutter.
 
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