This is a square mahogany plate with a removeable back and a sliding roll-top front. The leather flap that would be used to pull the back out of the frame is missing. However, the back is spring-loaded and can be removed (.B). Inside the wooden box rests a removeable 5X7 metal insert (.C) to hold a glassplate in place. It is coated with flat black paint. The plate can rest within the light-tight box either horizontally or vertically.
On metal insert inside holder (.C): "EASTMAN FILM SHEATH | MANUFACTURED BY | FOLMER & SCHWING | EASTMAN KODAK | ROCHESTER, NY | U.S.A. | PAT. MAY 11 - JULY 20, 1918".