A sign/abbreviation for "magister"

[James Kass via Unicode]

Suppose someone found a hundred year old form from Poland which included 
a section for "sign your name" and "print your name" which had been 
filled out by a man with the typically Polish name of Bogus McCoy?  And 
he was a Magister, to boot!  And proud of it.

If he signed the magister abbreviation using double-underlined 
superscript and likewise his surname *and* printed it the same way -- it 
might still be arguable as to whether it was a writing/spelling or a 
stylish distinction, I suppose.

But if he signed using double-underlined superscripts and printed using 
baseline lower case Latin letters, *that* might be persuasive.

Doesn't seem likely, though, does it?

(Bogusław is a legitimate Polish masculine given name.  Its nickname is 
Bogus.  McCoy is not, however, a typical Polish surname.  The snarky 
combination of "Bogus McCoy" was irresistible to someone of my character 
and temperament.  "Bogus" is American slang for fake and "McCoy" 
connotes being genuine, as in "the real McCoy".)