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.