Appreciate the info on leather dye . . . now to find out the best way to seal the pores.
Kodak had a tendency to put various modifications on cameras almost at random, it seems. It would be no surprise to me to find a C version with doors or a D with a split case. I have an original with a high serial # and no metal film guides and another with a low # that has them. That 1D that just sold today on Flea Bay had a T-shaped level (like the one generally used on the short-lived model 3A) rather than the usual bulls-eye style level, and no evidence on the camera top that a bulls-eye had ever been on there.
Anyhoo, the version normally is shown on the inside of the door, but then Kodak wasn't always consistent there either. They might have stamped it with something like:
No. 1D Kodak Panoram
No. 1 Kodak Panoram
[insert any conceivable variation]
Then, there is always the possibility that the camera was repaired somewhere in its 80+ year life with its damaged door having been replaced with one cannibalized from a junker.