Blyth day 16 - where there's muck there's brass

I've had this letter plate for years. I used to work for a company called Bannerworks in Huddersfield. Our offices were in an Edwardian building above the TSB. It's too small to be really practical with modern C4 envelopes so we changed it for a modern plastic one. I kept it..

I've finally found a use of it after carting it around for twenty years.

I always thought it was iron 'till I took a wire brush to it tonight.