Thank you so much for a very comprehensive reply.
Firstly, I think i must perhaps accept that the stamp on the fork is a serial number not a date.
Secondly, I find it fascinating to see (and try to imagine in 3D) this extraordinary urban landscape with all those different but associated factories tightly packed together in the midst of rows of houses and schools together with an Inn and a malthouse. Having been brought up in a small Essex town, such an "industrial town village", almost self-supporting, within a vast city, is something I am not at all familiar with. I did a while live in Newcastle on Tyne but it seemed to be of a very different character. Here in Sweden, with it's greater area, small population and widely spread resources (minerals, water etc.) there is nowhere that really compares. (Except perhaps w.r.t. weaving mill towns.) There arose multitudes of small self-contained industrial communities,in the midst of forests, but for a comparison there would have to be a nail factory in the midst of the Cotswolds.
Perhaps now that I have a picture of my fork's origins I can happily let this thread rest. Just by coincidence my eldest (Swedish) daughter is at this moment in Birmingham on a study visit to one of the hospitals. As she is the only one who has so far grown any vegetables she may be the one to inherit the fork. Perhaps then in the future there will at least be one person in Sweden who, whilst digging up a carrot in a forested landscape, will be reflecting on a hundred year old Birmingham industrial community.
With kind regards Jonathan