I have original stamped Campbells on the Flash, been on since I bought it in 1997/8 and well before possibly, still good, I also have a set of similar not stamped and made in UK at the same factory (I was told) and the shape of them and quality is as good I would say, although thet have not been on a bike for too long (bought as replacement for the Campbells but not need yet).
I also have a set of Goldie mega type , quality not quite as good I'd say.
I think A65 were similar in shape to mine ???
I'd have a good look at the cheaper ones (look for shape, and weld quality to compare to Campbells should look like the ones below, can't recall where I got mine , these are Burton Bike Bits with whom I have no connection, other suppliers are available as they say