I have a few photos that were mounted to non-acid free mounts, and in general, the photos are fine. The exceptions are a couple on really bad mounts where the mount cracked under the photo and damaged the photo with it.
But those are also 100+ years old, so you've got a long way to go.
I really have to make scans of some of that stuff.
I'd also think the photo and mount are newer than the 1920's.
The fun thing to do would be to see if that photo is on p59 of a book, or maybe a bit after since they also re-wrote the date. Finding what that exact photo was used for would be pretty cool.
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