My Grandpa left me this 1951 18k gold Zenith 133.
The 133 is the first automatic movement by Zenith, which is clearly very attractive from a historical perspective.
But what makes it such an unusual piece is that this movement is a bumper, rather than rotor, automatic. Rotor automatics, now the universal standard, have centrally pivoted weights that spin when moved by gravity in a full 360 degrees, winding in either one, or in some instances, both directions as they travel. The bumper was built along entirely different lines. There is still a pivoted weight, but this only moves through a limited arc of travel and cannot rotate freely. Once it swings out to its fullest extent, it is bounced back off buffer springs in the direction from which it came. It is this rocking, bouncing motion, which can be felt on the wearer’s wrist, that led to movements of this type being known within the collecting community as bumpers.
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