I wouldn't worry too much about the date stamp on the back of photos as often they are merely "File dates" of when a photo was potentially used or added to the periodicals collection and often doesn't quite coincide with when the actual photo was developed. That being said it does provide great provenance and obviously any photo can not be any newer than the date stamp (as long as it is a legit stamp--as it is in this case). Thus, even though the photo may be from 1915 or 1916 or even earlier it would still likely be considered a Type 1 or Vintage 1 (depending on the scale you choose to use).
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