Russian bronze trim on the armour (?) the mid-eighteenth century

Interesting panel, made of sheet brass stamping. In the center is placed the image of the Russian double-headed eagle with a chain of St. Andrew and the inscription "For faith and loyalty". The eagle is surrounded by vegetable curls. The size of the pads 132*166 mm. unfortunately, we were not able to accurately attribute it, we can only assume that it could be the Central part of the breastplate of one of the guards regiments of RIA. The plate has an archaeological origin. The guarantee of authenticity.