I picked up this Zenith as I found the overall condition to be OK, the face is clearly faded but the case and movement looks to be good. My first Zenith actually, it is a Sporto and with serial number 5320977 I think it might be from 1962. The movement is a 18 jewel caliber 120, it has a hacking function. Can someone give me more information on the timeframe of the Sporto model? This is a bit on the sideline from my pocketwatch collection, appreciate any input.