SNG ANS includes two Loas AR fractions: 137 - Same type as yours, but with the bull on the reverse to the left; 1.07 grams, therefore the same denomination as yours. 138 - "Triobol" with acorn reverse, but 1.02 grams, much lighter than 1.35 grams listed in Sear GC.
I am reviving this thread to show you a Laos stater I have owned for a while but was lazy to snap some pictures. As lazy as I am, for the write-up I will refer to @ancientnut OP. Just to add that the literature reference for this coin is Sternberg 5.