Both photos were indeed sold through Heritage previously, and have larger scans hosted on their site:
http://sports.ha.com/itm/baseball/ci...umbnail-071515
http://sports.ha.com/itm/baseball/19...umbnail-071515
To my eye, in looking at the larger scan of the Foster photo and per Heritage's description, the central photo is embossed. Mostly I'm just posting to point to the previous sales. I have no comment either way regarding mounting practices, but would not discount Rhys's opinion, as he has handled many many more mounted photos over the years than I have.