4.25mm Square Hole-Wide Wing Winding
Key/8 Wide 2 5/8" wider winding wings make it easier to wind, otherwise same as Key #8+. Size 8+ Brass plated key generally fits all modern (since 1970) 3 hole German made movement 8 day wall and mantle clocks. 4.25mm square hole. Measure square winding post for fit.
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