I bought this watch (on this site actually) from William Massena. This is from the very short era right after it was sold by Frey and re-imagined by Gnutti and Co. It has basically the same dial as this piece you've shown. I am fairly sure it's a vintage dial that they used at that time. But the finishing on the case, and movement are absolutely top-notch - much nicer than Minerva was before the Frey sale. It has a 13-20 in it as well. This dates from around 2002-2003. I've never seen this single-button version, but not saying it didn't exist. But the one I'm showing here does exist and it's a spectacular watch.