Well , I spent all night on it, and I can't find any reference to an original Samarinda 1 airfield. I've started looking at 3 other locations, one of which was on a pre-war map ( Soengaiterim ) which is a bit far from Samarinda, but there again, so is Samarinda II. Muara, NE of Samarinda is a more likely candidate.
I happened on another Borneo airfield by accident, looking for Madang, Java and GE dropped me into Borneo. This location is marked as an airfield on NEI maps 2°47'5.70"S 115°18'50.27"E . At first glance is looks a bit short until you go ESE and the rest of the airfield is revealed especially on a 2013 rollback on GE. I can't find anything on the usual websites , but there it is with a distinctly pre-war circle and bisecting runway layout. Another thing I've noticed is cleared spaces appearing on legends on maps. I'd never thought about them in terms of airstrips/airfields before but I suppose it should be considered if they're long/wide enough?
I'd appreciate it if other people could take a look, if only to confirm discount it as an airfield?
Many thanks
Solotk