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#2017: Longines Caliber 19.73N - Balance Complete. See updated interchange information.

From: vlad@stylus-design.net
Date: February 23, 2017
Complete Description: For a 1930 Longines Caliber 19.73N double dialed chronograph.  Balance complete or a balance wheel and hairspring, with or without a balance staff, for any of the following Longines calibers: 18.68N, 18.69N, 19.57, 19.58,19.70N, 19.71N, 19.73, 19.73N, 19.74N, 19.75N, and possibly others. The hole in the balance wheel arm for fitting on the balance staff is 1.35-1.36 mm. The diameter of the hole in the roller for fitting the balance staff is 0.64-0.65 mm.

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