I've got a civilian Signet 35, and I can confirm the quality of the lens, as well as ability to get 38-40 frames on a 36 exposure roll (it's barely wider than a Rollei 35, which can get 40, and a Signet can be loaded with minimal pre-closure advance). Sadly, mine has a completely non-functional RF (pretty sure it worked when I last used it), and I don't have the space or time to open it up.
This one, however, has too much collector value to be in my price range.
I often get 38-39-even 40 images on a roll of film in my Nikkormats, but nobody in their right minds would pay me this sort of money for any of them...
I've not seen one of these babies (the Signet, not the Nikkormats) in a long, long time. Nowadays a CLA on this baby will probably cost a kidney, assuming one could find a repair person (or asurgeon) to do it.
This Signet is more a collector's piece than a 'usable'. Its market is for collectors. For the price the OP is asking, maybe an auction house... IF it's an Air Force Signet, and how to know this for sure??
Just curious. It's a little beauty, love that black finish. One of my 'mats is the same, with small patches of beaut brass on the edges. Hey, maybe it's a Japan Air Force Nikkormat...
Seriously, your Signet is a rare one, and my best wishes go to you for a great sale.