- M. Hertsch & Co. (Inhaber ['owner of']: Zumstein catalog, Expertization)
.ch
- MadDonnell, David (.ie)
.ie
- Maier, Jörg (.cl; incl UK Post)
.de
- Maigatter, Lutz (Soviet zone)
.de
- Marchand, Jean-Claude (.ch) .ch
- Marco, Martin (.il, Levant, Romania)
.il
- Consulting Member AIEP
- Maresch, William H.P. (.ca) .ca-ON (U)
- Mark Brandon ('Investment Advisors',
Expertization: KG VI, QEII, Errors)
.uk-SU GU3 1EL (U)
- [cf David Brandon]
- Marriott (CVO, RDP), John B.
(Trinidad to 1909 & Commonwealth)
.uk-SU
- Matl, Albert (Japan, Europe)
.at
- Consulting Member AIEP
- Marxer, Peter (.li)
.li
- Mayer, Henry (Official control prints)
.de
- Mehlmann, Volker (Lothringen 1870-1871)
.de
- Meiners, Roland (German Southwest Africa)
.de
- Melnikov, Leonid (pre-adhesive-Soviet +)
.ru
- Mexico-Elmhurst Philatelic
Society Int'l (MESPI)
(.mx)
.us-CA
- Meyer, Bernd (Officials 16-98, control prints 1916-1945, 96-33)
.de
- Modry, Dr. Fritz (Soviet zone, perfins ..)
.de
- Moeller, Carl Aage (.dk & DWI, .fo, .gl, .is)
.dk
- Mozek, Dr. Christian (Bergedorf)
.de
- Müller, Hanfried (WW2: E. Prussian fieldpost; Soviet zone)
.de
- Müller, Rolf Frieder (WW II : fieldpost, Michel 1-12, 14-15, 17)
.de
- Müntz, H.G. (.il) .il
- Murray Payne Ltd. (KGVI, incl Expertization, articles) .uk-SO
- Stuart Murray Babbington and Richard George Payne Pollard (Dickon) ; phew..
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