Michael: Thanks so much for the information. Most helpful. Yes, I agree, the lack of overall decoration would suggest military use. Which, in a way, makes the lock even more interesting. Yes, I'm sure there are very few of these around. Thanks, Rick.
Hi Fernando. Yes, now I see the chain. So, it's missing part of it's secondary sear

Thank you so much for noticing. Hmmmm. Thanks, Rick.
I don't own this Lock yet. I wanted to get both of your opinions before taking the plunge. Of course, it won't come cheap. I'll have to decide sometime this week. It would sure make a nice addition to the lock collection.