Not sure about the authenticity of the dial finish - the "Automatic" does not look right. These usually have the word in a stylised font with a lower case 'a' at the start.
The movement however is a peach. Zenith were late to the automatic party and only introduced their first bumper, the 133, after most had switched to fully rotating oscillating weights. Because of this, the 133 and the later 133.8 and 71 movements are probably the best bumpers ever made. Your one, the 133 is much more scarce than the 133.8 The cal. 71 is a 133.8 with date complication and is the rarest of the lot.
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