Rik may well be correct in suggesting that it's been coloured from a black and white - the sort of thing that could be ordered when I was at primary school in the 1950's - BUT, I have some "bought" colour slides from the same era where the originals were on something called Dufay film, and each one in the film had to be processed separately. Is the photographer abole to enlightn us?

Stunning photo. Obviously a coloured B/W print but exceptionally done. Any chance of a BIG version ?
Rik