Looking in my gate

Looking in my gate
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Why am I seeing a watermark?
Title: Looking in my gate
Description:

Adrian Vanderveer Martense's snow-covered driveway after the March blizzard, Brooklyn; A. V. MARTENSE, AMATEUR. [stamped in black ink on label on recto]; 10, 31 [written in ink on label on recto]

Date: 1888/03/14
Location: Brooklyn (New York, N.Y.)
Flatbush (New York, N.Y.)
Creator: Martense, Adrian Vanderveer, 1852-1898
Collection: Adrian Vanderveer Martense collection
Subject: Winter
Trees
Drive ways
Fences
Snow
Blizzards
Houses
Dwellings
Institution: Brooklyn Historical Society
Medium: Lantern slides
Rights: PUBLIC DOMAIN
ID: V1974.7.32