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Examine the movement with a jeweler’s loupe or magnifying glass.
All Waltham pocket watches have a serial number stamped on the movement (the "works") inside the watch.
The serial number can be checked against an online Waltham pocket watch list, which will give the approximate year of manufacture.
Pressing down the crown releases the spring-loaded latch that opens the front cover over the crystal and the case back cover.
Carefully wedge a blunt blade or your fingernail between the case and back cover to help pry it open.