That is an incredibly cool example. The Btzg stands for "Buitenzorg", but I have not seen the "M.L." initials together (only separately for Southern/Eastern (M) and Western (L) Borneo, respectively). There are Military Police abbreviations that start with M.X. (with X running from A through G), but this one is unique. Best guess: Military Police Buitenzorg, with no other examples described (in Martens & DeVries, anyway). Thank you for posting.
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