Thank you both Gene & Aleksey. I gave those Tibetan numerals a look, but am unable to make heads or tails out of the inscription...
The one question I would have is the length of the inscription, which if indeed Tibetan would appear to short to translate to anything other than one or two numerals. The shape and general appearance of the characters do seem to bare resemblance to the script, but also look somewhat similar to the (is it Lepcha?) script for which a Tibetan translation is given at that link.
Either way, given the frequent appearance of archaic and/or colloquial scripts and/or dialects, I'm guessing a translation may be too much to hope for.