Art Deco Soviet Large Natural Baltic Amber Cufflinks and matching Tie Clip

Fantastic set of Art Deco Natural large Baltic Amber Cufflinks and Tie Clip in great condition. Solid silver attachments to the Amber Cufflinks with Hallmarks confirming the Silver quality, 875 just visible with KM  and S and a Clover leaf? The Tie Pin is marked Melchior Silver, heavy Silverplate. The Amber is totally natural with many inclusions, including what appears to be a piece of charcoal. Inclusions like these can be up to 40M years old, when debris, plant leaves and even insects were trapped in the ancient Amber resin sap. The cufflinks are dated at Circa 1920’s. Dimensions approx.: Cufflinks 3cm x 2cm x 0.8cm thick; Tie clip 4.6cm long x 0.5cm wide max. , Amber 1.,4cm square x 0.6cm thick. Ukraine, Russia. Circa 1920’s