Hans Sanders (NL)
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General Information

I believe the Tibetan Ga-den Thangka is one of the most attractive coin for a numismatist because of e.g.;

1.  The beauty and differences of all eight Buddhist Symbols 
2.  The variations in the location of the Buddhist Symbols
3.  The variations of the symbols in the outer angles of the petals.
3.  The variations in design of e.g. the lotus flower  and presence of spokes 
4.  The differency in dies
5.  The big range of number of dots around both borders
6.  The variations in the size of the inner circel and the size of the coin itself
7. The known errors
8. The secrets behind      ; the mintplaces
                                         ; some markers
                                         ; the unknown minted numbers of each variety
 9. The commonness and attractive purchase price in general

      
Description of the Ga-den Thangka

Rhodes class Fii/KM Y13.6 

Obverse:  An stylised Lotus flower within a circle surrounded by eight Buddhist Lucky symbols placed in petals.

Reverse:  eight petalled flowers surrounded by an inscriptions broken up into eight mostly oval frames. The inscription in tibetan reading is;  'Ga-den Pho-dang chhog-le rnam-gyal' with means 'The gaden palace Victorious on all sides'.

Monetary System
10 Ska (rung) = 1 Sho (kang), 
15 Ska (rung) = 1 Ga-den Tangka
3 Ga-den Thangka = 1 Indian Rupee

The exchange rate of the rupee against the Ga-den Thangka varied from time to time. Three Ga-den Thangkas may be taken as the highest rate and about six  as the lowest.

                                                         Date
Based on the Tibetan calendar, Tibetan coins are dated by circles which contains 60 years each. To calculate the western date you use the following formula.

Western date = ( (Number of Cycles -1) x 60) + number of Year + 1026
For examble 1900 AD = 15 th cycle, 34 th year
Remark; There is no writen date on the Ga-den Thangka coin.