An interesting pair of original photos from South East Asia. I think it looks like they might be from the Dutch East Indies (Indonesia), showing the staff, faculty and students of a colonial surveying or cartographic training school.

Possibly it is the Topografische Dienst van Nederlands Indie (Netherlands Indies Topographic Survey). An alternative is that it may be the Dutch Army of the Indies Topographic School in Malang.

I'm not certain it is Indonesia. Another possibility is that it is in Malaysia. Rare colonial photos in any case. They measure 292 mm wide by about 229 mm high.

The formal photo is behind glass and in great condition. The picture of survey teams in the field, being examined does not have its glass and has a few marks. They are in their original ebonized frames.

Questions welcome.