Waltham Colonial Riverside, 21J, 1936

Another excellent size 12 Waltham, this time a "Colonial Riverside" with 21 Jewels including the mainspring barrel.

The Swiss Lever escapement has a Breguet Sprung screwed balance with double roller, the hairspring appears to be elenvar to reduce temperature variation and the movement is adjusted for temperature. The serial number dates it to 1936.

The Colonial movement is particularly slim and in its case is only 0.4" / 1cm thick.

A perfect watch to wear with evening dress or military mess dress but equally suitable for day to day wear.