Very large solar prints maybe?

These arrived yesterday, I had bought them from the usual Feepay for a grand total of £4 which included postage?! How they can do that is beyond me as these are massive.

Two hand coloured over painted solar prints 20.5 x 25.5 Inches.

I’m saying Solar prints because thats what they usually are, but in some FB online discussions yesterday someone suggested they may be direct prints from ultra large glass negatives. If thats the case then the neg size must be a round 16×20 inches…. Does anyone have any further info on this? of portrait negatives this size?

HaroldMaud1A

HaroldMaud!B

HaroldMaud2A

HaroldMaud2B

They are in good condition but pretty dry and brittle around the edges. There is no further info on the reverse unfortunately. So I will add them to the growing wall archive at the studio.