[Huysmans]

Hey Bryan,

as others have stated, I'd leave the photo as is.
Very little could be gained by removing it with damage a possibility, plus the reverse of the mount does have editorial notes and stamps.

Regarding possible damage to the photo from the mount itself, the overwhelming majority of photos from the era and earlier, if on contemporary mounts, are in no fear of any acid damage.

... great image by the way!