Are these 100 YEN coins pure silver?

Hey everyone, Just was going thru my old coin collection and found one of these coins. Does anyone know the silver content of these? Thanks in advance for any answers!!
:thumb:
http://www.ebay.com/itm/Phoenix-SIL...600?pt=LH_DefaultDomain_0&hash=item2c616c2220

 

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Y # 77 100 YEN
4.8000 g., 0.6000 Silver 0.0926 oz. ASW, 22.5 mm. Ruler: Hirohito (Showa) Obv: Phoenix

Means these are 60% silver.

 

Right on! Pretty nice to find in my old childhood coin collection!