I have a Thomas Turner BLE 12 gauge that the late Alfred Gallifent thought dated to the 1890s. If I recall correctly (it's at home and I am not), it has Birmingham proofs. Lovely old gun with an interesting engraving pattern - scrolls around a fully opened flat acanthus leaf at the center of the pattern on each side of the receiver. I don't think I've ever seen another British gun engraved with such a pattern.