Antique 3 piece Adams Co Pat. 1897 Round 15 3/4" Cast Iron Floor Grate Register Vent. Patent date of August 31st , 1897. This is a beautiful old 3 piece working moving grate which opens or closes. Stunning  architectural piece with all its original pieces.The wonderfully aged patina only comes with age. The Center piece 8 point leaf designed star is truly unique, Rare to find one with all its original pieces. Most available no longer have the original centerpiece as it has been replaced with some other cast iron piece. Value comes with this it’s aged patina. Manufactured in Dubuque Iowa.