Anyway, that small »F« in the upper corner of the right flats, I have seen prior. Just can't recall what it denotes. But I would hazard a guess that there are some Belgian stamps on the tubes forward of the flats.

Too, I seem to recall that the H to which I referred, whether present or not here, disappeared in the mid to late 1920s??


[Linked Image from i697.photobucket.com]

Note Auguste Francotte was involved. More than likely the link for sourcing.


Hochachtungsvoll,

Raimey
rse