Help \ Info on Maris 61st HR photo

[YankeeFan]

The item shown below is being offered to me, but I don't know what to make of it. I would appreciate any information regarding why it is in the form it is in, and an estimate of its value.

The seller told me that he purchased it from the family of a man who worked for the NY Daily News.
The photo is attached to thick cardboard stock and is numbered on the back. It appears to have been in some sort of binder (wide, white tape on the left edge).
The size of the photo itself is 13.5 x 10.5 inches. On the other side of the cardboard is the original newspaper clipping of the same photo.

He has some other photos which are mounted just like this. Nothing else of real historical significance. Some of the boards have multiple photos showing the sequence of an action play, for example.
Some notable players are pictured, but not always prominently. In these cases, the photos are about 3.5 x 5.75.
None of the others have the yellow tape with the number written on it; just a 2 or 3 digit number written in pencil. That yellow tape may be an auction lot number, though the seller did not say he got them at an auction.

Specific questions I have are:
Is this type of mounting a common practice at a large newspaper, possibly for archival purposes?
Since the photo is attached, I can't see if there is any stamp on the reverse, but do you suppose these would be considered Type I photos?
Do you have an opinion on the value of the Maris 61st HR photo?

Thanks in advance for any help!