Antique stamped heavy metal abstract brutalist brooch

Antique heavy abstract brutalist brooch pin. Has a maker's mark but I can not find out. I found another brooch online with the same maker's mark and it was simply listed as "pre-war brooch". ❤Jewelry may show signs of wear and/or require cleaning, especially vintage jewelry. Please look at photos closely. 🌸Bundle to save! The more items you add to a bundle, the better the deal :) 🌼Smoke free home 🌍Shipped with recycled packing material when possible. Let's save the earth 💚 🌿New to Posh? Get a $15 credit with the referral code BOLDLIKEYOU when you register BB