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Master Print
This term refers to the original photographs, not photogravures, sold by the Curtis studio with an ink signature. Master prints were made with other processes in addition to platinum. Many of these have an embossed stamp or "blindstamp," approximately 1/4" x 5/8" in the lower left corner.

A Note on "Vintage Photography"
This term refers to photographs printed by the photographer, or under his/her supervision, within the general time frame in which they were first exposed. Vintage photographs have greater value than images printed in recent years from the original negatives or plates.