Fireplace surround with the Spanish Habsburg coat of arms

Semi-circular fireplace surround with a Spanish Habsburg coat of arms; double-headed eagle with a coat of arms on its breast, above it a crown with on the right: 600 [?], on either side a pillar with a lion, decorated rim in relief; worn in the center, slightly chipped, bottom and back left break lines, some spots blackened, cement residues, back with tar residue. On the left the letters [L?] and on the right of the coat of arms the letters OL.