Vintage Horse Charm/Pendant - approx 1.5 X 1.5 in

I’m not 100% sure if this is sterling silver. It looks and wears like silver for over 30 years. It has a stamp but it’s too small for me to read. 🐎🐎🐎🐎🐎🐎🐎🐎🐎🐎🐎🐎🐎🐎🐎🐎 *****TRADE PRICE IS $20 FIRM****** SMOKE AND PET FREE HOME