Ulysse Nardin Dual Time 42 mm

I have a pocketwatch that was in my grandfathers watch shop when he passed away and I have been trying to learn more about it. I have been told the maker was Robert Hessel in Erfurt Germany. I have not been able to find any information on this person or any other samples of his work if this is true. This name and city is engraved inside the back cover of the watch. I assumed this was the owner...but someone said this is the watch maker. There are several other marks some I know are silver marks ........

When the quartz revolutionated the watchmaking, many swiss companies broke down and went out of business, and of course they no longer exist...Any brand that you will like to be still active?I have two brands, that I don't know much, but have two pieces from them, Technos and TressaTechnos is no more a swiss brand, as it still exists as a brazilian brand, and Tressa is forever gone, as Rado acquired it, and shutted down later...From these two, I would like to see Tressa still aliveAny other, vin........