Copper Tray, Medium Size, Nice Design, Vintage Antique?

Medium sized copper tray, with a nice design stamped in and a waved and raised rim. In decent condition but needs some tlc with the brasso to bring it back to its former glory. Measures 18 inches long by 12 inches wide. In the photo you can see one side has got a dull section that looks like shadow in the photo but I think its actually dark paint which want cleaning off. Not sure of the age, it came from a house clearance where most items were between 1850 to 1930 so guess its somewhere in that region.
Copper is worth a lot as scrap metal and theres a fair lump of it here.