This is a bit of an obscure one, and more relevant to boxing than wrestling. However, I know we have a few folks here familiar with Manchester and its wrestling connections, so I wondered if anyone remembered the Lonsdale Gymnasium Club that was in Smithfield Market.
If you look at the photos in this newspaper advertisement they had a collection of old wrestling posters, independent ones too. Seems like it may have been a short-lived enterprise.
I think the clue is here. THey had posters up to 1970