Antique Russian Baltic Amber Oval 925 Sterling Silver Brooch Pin Signed Large

Antique Russian Baltic Amber Oval 925 Sterling Silver Brooch Pin Signed Large. This has 3 stamps on the bar of the pin (see photos) that appear to be of Russia origin. 40mm x 24mm entire piece, amber resin focus is 30mm x 22mm x 7mm depth. The bar is slightly imperfect where stampings are located.