Mmm, I do have a Spong mincer, given to me by my mother, as she no longer used it. I think she may have inherited it herself from a grandparent. It still works.
I do have two other mincers (that doesn’t count as a collection), a Kitchen Craft one I bought whilst on a self-catering holiday (probably Landmark Trust) for a specific dish I wanted to make. It works, sort of. And the best of the lot a no-name one bought from the ICA in Tyresö.
Back on the subject of forgotten foods: beef stroganoff, which I think was popular in the 70s/80s. I should have remembered because I have made it more than once. The quick version, mushrooms, sour cream, mustard and allspice. Beef to be rare. I made it a couple of nights ago, with some thinly sliced wing rib which we had had on New Year’s day. Stirred through just before serving so as not to lose the beautiful pinkness.
And finally back to prawn cocktail. I have read that there was a reference to it in a 1962 episode of Coronation Street. Now I have never actually seen any episode of that programme, but I doubt it was cutting edge. So prawn cocktail must have been well enough established (at least as a phrase) by that time.