Kathmandu
Jaya Bhupalendra Malla (1687-1700AD). 
Tiny silver dam.

Obverse:  4-character inscription

weighs about 0.05 gram (one-twentieth of a gram!)
and measures 8 mm.
Paper-thin, uniface.  The reverse (back side) is just the obverse (front side) showing through.   

This would be one of the smallest, lightest coins in any collection.
Wikipedia reports: "Watch Your Language lists the coin as one of the possible sources for the English phrase "I don't give a dam[n]″, due to its small worth, but provides other sources as well"


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COMBINED POSTAGE:
USA: flat $5 fee per package, no additional postage for additional coins.
Worldwide: charged at actual cost (though eBay) per package, price should be the same or nearly the same no matter how many coins. 

30 day returns. 
All coins unconditionally guaranteed genuine without time limit.

Do not pay until it is time to ship:   If you think you might buy additional items within the next week, you should pay when you are done with all of your purchases.   In order to maintain a preferred commission schedule, eBay expects me to ship items within one day of receiving payment. When I receive payment I ship as soon as possible.

Prices are firm.  No volume discounts.  No bargaining.  Same prices for everyone. That is just the way I do things.