Presumably even if the original is on a 35mm negative, this could then be printed to about 20” X 16” scanned and photographic interpolation introduced for making larger prints through digital output. But I’m not sure if the original post refers to just silver prints at that size?
No we don't know how they get from A to B.
Mark Barendt, Beaverton, OR
"We do not see things the way they are. We see things the way we are." Anaïs Nin