we don't know almost none from which they come

here are all North Korean vehicles
http://www.imcdb.org/vehicle_222254.html
http://www.imcdb.org/vehicle_519877.html (same as above)
http://www.imcdb.org/vehicle_519878.html
http://www.imcdb.org/vehicle_416724-M1974.html
http://www.imcdb.org/vehicle_416727-M1977.html
http://www.imcdb.org/vehicle_416788-M1981.html
http://www.imcdb.org/vehicle_416726-M1992.html
http://www.imcdb.org/vehicle_445610-M1992-SPG.html


only one vehicle we know offical factory and designation because it's a clone of a Chinese one http://www.imcdb.org/vehicles_make-Sinhung_model-VTT-323.html

I am not sure "Sinhung" is actually manufacter or rather just model name http://en.wikipedia.org/wiki/VTT-323