[drc]

My opinion is putting an original old photo on a modern (or in this case, different) mount isn't inherently or always a a bad thing. I've seen valuable antique photos mounted on clearly modern mounts as part of restoration, and Culver photos are often pasted to modern manilla cards-- I don't think the Culver cards devalue the photos on the market. It's the trimming that would be the problem for me. I'm not saying I'd like a Conlon photo to be pasted to a different period mount, as I wouldn't, but that isn't a huge issue for me.

But an original Conlon photo of Wagner would still have value, even if trimmed and remounted.

I take the 'acceptability' and 'value' of remounting on a case by case basis. I won't give a blanket rule. And I believe there are cases where attractively mounting an old photo will not lower the value at all. Though I think it's best done if the mount is clearly modern.