1.
A "Press Photo" is one that was taken for, or by, a magazine or newspaper.
The issue of whether or not is original doesn't come into play here. All photos produced from a source, film or digital, are originals in a sense. What you should recieve is a photo made from the original source or a digitization of the source if it was originally shot on film. You shouldn't get a 'copy', which would be a photograph that has been re-photographed, unless that is stated.
Being a Press Photo, it was originally mass produced if it was published. Mass production is in the nature of photography. You are not going to get a one-of-a-kind or a limited edition from a press photo.
2.
When I worked in the PR department for a large company, we used to send out thousands of PRESS PHOTOS out to various magazines, newspapers and journals with our press releases. We would make one good print and then send it to a company that would make an 8x10 copy neg and then make as many contact prints as we wanted and send the whole thing back to us including the copy neg.
There may be a stamp on the back of the photo that might give you a clue that it was from one newspaper vs another, but maybe not.
When I worked for a newspaper, we used to make 5x7 prints that were sent to the pressroom to have Velox's made (screened prints).
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