Any info on Zenith 120 V?

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I recently acquired a Zenith 120 V but can’t find any info online about this watch. It is made of 18K gold and measures 35mm in diameter. Based on the case ref it was made in the 60s. I know Zenith made some models with number dials, for example 220 S, 230 S, 250 S which used prototype movements. I have no idea what 120 V could stand for, so any additional info is greatly appreciated 😀

Yes, there are some problems: bent lugs, oxidized hands, dirty movement...😟 But the case is
sharp and the watch is running well.



Movement pic from seller. Looks like it’s a 40-T? Unfortunately I don’t have better pics of the
movement as I have not opened the watch.