There are about a dozen different Dark Bronze Greens. It's not quite as difficult to pin down as 'British Racing Green', but almost. If the supplier can more or less match it then why not use them ?
With lead now illegal, no modern representation of a 1940s or 1950s colour is ever going to truly replicate the original colour under all light conditions.
We do the best that we can, but we'll never achieve 100%
