Coins from Nepal are tough for Westerners. The elaborate symbology, much of it Buddhist, is foreign to Western eyes. Rudy has described a coin with 'lots of letters' and 'the appearance of a calendar.' Coins from King Prithvi Bir Bikram come to mind, although there is a good chance Rudy has a different coin.
Silver mohars, although exotic, do not command very high values due to lack of collector interest. CoinQuest expects, however, that this will change rapidly as the Internet exposes more and more people to the joys (and frustrations) of coin collecting. Catalog values for these coins run like this:
worn: $10 US dollars approximate catalog value
average circulated: $20
well preserved: $35
fully uncirculated: $50
If you have a nice looking example of one of these coins, it is wise to seek out a knowledgeable collector or coin dealer for a first-hand appraisal. There is a complicated dating system on Nepalese coins. Some insight can be gained at this CoinQuest link.
Note that Rudy describes his coin as highly polished (that's bad), corroded, and harshly cleaned. With all those problems working against his coin, it will not be worth very much. See our Important Terminology page for more information.