By now it's obvious I am catching up on photos for my web site.
Interesting sheathes have always interested me and this is one of the best.  It's a WW2 fighter in a Von Lengerke & Antoine sheath.
I have linked to a great article by Crutchtip which was also published in the RKS newsletters in 2010.  All the detail you could want.  Thank you Joe.  
V.L. & A. Sheathes  This humpback blade is a full 8-1/4" ....and was probably 1/16" longer but the tip has been broken.  I slid this into several other Heisers from the period and it would not seat in any of them.  
 
    