0.900 Gold 1910 20 Francs 'Vreneli' Coin in 18k Yellow Gold Frame

.900 gold 1910 20 Francs coin pendant in 18k yellow gold frame.  ID#: PEN520 Coin:  Obverse: Bust of a young woman from Oberhasli, facing left, with tresses and a garland of Edelweiss. Mountains in background. Script: Latin Lettering HELVETIA'  Reverse: Embossed pattern with 22 stars in three group