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1971 Matti Hyvarinen for Sirokoru Ky large abstract silver ring

A wonderful piece by Marri Hyvarinen the Finnish silversmith & jeweller for Sirokoru Ky.

This silver ring was made in 1971 and comprises a large domed abstract design above a silver shank.

The shank is marked "MJH" for Matti Hyvarinen.
It has the date latter S7 for 1971, 925H for silver and the mark for Turku, the town where Hyvarinen established his factory Sirokoru Ky.
It is also stamped with three crowns in an oval cartouche & with an "S" in a hexagonal cartouche confirming that the ring was imported into Sweden some time after manufacture.

Approximate dimensions:
Weight: 0.7ozs - 21gms
Length of top: 1.65ins - 4.2cms
Width of top: 1,26ins - 3.2cms
Ring size: 0 (UK) - 7.25 (US)