Here is an interesting bronze ring by the Finnish designer Pentti Sarpaneva (see bio).  The design of this cuboid is based on Karelian embroidery patterns, and is part of series called 'pitsi'.   Split shank , so one size fits all. 

Condition: Excellent, no visible damage

Marks:  P.Sarpaneva, bronze, Finland

Size:  Split shank, so adjustable to most finger sizes.  Top of ring 1.5 cm (0.6")  square. 

Year:  1960s