GM/Ford? based armoured vehicles of the Dutch East Indies

[David_Hayward (RIP)]

Judging by the grille it's a 1939 CIVILIAN Model COE Chevrolet, and therefore perhaps a Model VG..depends on wheelbase and single or twin rear wheels.

http://clubs.hemmings.com/clubsites/...939to1945.html

gives you the models! Excellent find!