Many thanks for taking your time with this, Bert.
I suppose the evidence for dating Timarchus de facto consists of the overstrikes
that Demetrius I made of his Babylonian coins. There is, I suppose, also a
reliable chronology for Demetrius' campaigns against the Maccabeans, which
should post-date his defeat of Timarchus.
All the best,
Jens Jakobsson