Help with these two brass wall plates from (? )The 1900s

Embracing Color: Enamel in Chinese Decorative Arts, 1300–1900

Peerage Brass Plates - Ireland

Do these posters from WWII have any historical/monetary value? : r

Peerage Brass Plates - Ireland

Do these posters from WWII have any historical/monetary value? : r

Help with these two brass wall plates from (? )The 1900s

Antique Original 1900s Decade Antique Switch Plates & Outlet

Are these pieces from the 1700s? : r/metaldetecting

Pair of Copper-Plate Inscriptions with Engraved Designs