For Antiochus IV I find in B. V. Head Historia Numorum
p. 762, near bottom of the page, a diobol with the head of Antiochus and, reverse, a tripod lebes
. A diobol might be (?) 15mm in diameter, and this coin might have only the two words, Basileos and Antiochou
As you said, the others with tripod are bronze.
This is not my area of knowledge, but your coin interested me, so I tried. Probably this is useless to you.