Carl, I can’t wait to see your site. I too have a deep interest in Helvetias, although covering lots of models not just the military ones. I’ll take look when I get a moment to see what data I can share that might be useful to you. I’ve tended to avoid the DH models but I have a few of other types from the ‘30s as well as from ‘40s to ‘70s.
Do you have much info about the history of the company? I’ve read the usual stuff about Louis Brandt, the split from Omega, General Watch Company etc. but found out very little apart from that.
It’s great that you are doing this; I’d thought about something similar myself by was daunted by the prospect.
I saw your post on MWR as well, hope you get a great response.