Vintage Matti J Hyvarinen, Siroku, Finland modernist sterling silver ring. It is signed with makers marks "MJH"  and "925S" on the inner ring. It is approximately a UK size O or O 1/2 . Weight is 5 grams.  It is in very good condition. 

Condition: Very good  condition
Colour/gemstone: Silver
Metal: Sterling Silver
Size: Currently UK Ring Size O or O 1/2 
Era: Estimated 1970's