Both myself and zigzagwanderer worked in foundries,so that covers ironfounding and brassfounding. When I started my apprenticeship at the start of the 80's, there were 3 such companies in Birkenhead.
Est1892, MARSDEN, John, CHS, Birkenhead, (& Sons), brassfounders, 134 Bridge Street
SMM (Managanese Bronze)Dock Road, CH41 and one that I am sure Phil will answer for me as I have forgotten the name but were by the Dock Pub
and the building is still called the foundry.
By the mid 80's, only SMM Propellers survived which only did brassfounding and now this has gone as well. Photo's of which are on a separate link on the site