IDing some of the parts might help - there's what looks like a front DX canti and a U-brake for starters - so we're looking at early '90s (92/93?), and nothing too special but not unreasonable, it's certainly not as low as a Talera or anything. It's not all original (bars, Trek seat), but all the same, it's possible that knowing what model mechs, chainset and such are might hold the answer.
I think Zaskars use XT?