Hi Chris,
There is a short article on Martn Drewes on the Hyperscale web site here:
http://www.clubhyper.com/reference/drewesmb_1.htm
The author appears to have had direct contact with Martini Drewes (Lives in the same city). There is a profile and one photo (appears to be from the same shoot as yours) but does not show the code letters.
Regards
Michael