Not to sure on Navy stuff, but think it's possibly USS Wichita related, and 12 AMAS is a fleet support unit of some kind? I can't remember the details, it came up 20+ years ago at a show.   Randy

I have the same too. My 1st time in over 30 yrs seeing this marking and I have over 10 MX991'S and it's variants. 

Left is a Meyers pattern, I don't think these predate 1930. The lack of markings could be because Meyers sold them to other firms to be carded on their own cards and sold. This was a common practice of the era.    The one on the right appears to be an unmarked Gemsco. The pin stabilizing appears to be damaged or worn short, an extremely common occurrance given its age

Was lucky enough to add two more examples. One of which is another scarce saddle blanket emblem that has been converted to a screw post back. The heft of the emblem and its strong resistance to bending compared to the helmet version are wildly different. This one had had a very nice curve bent into, which would take some pretty decent effort to achieve.  This is my second example of the scarce saddle emblem. Updated display with new additions. This makes 7 enlisted examples in my collection with no officer examples unfortunately. 

I somehow missed this.  Very special group!  It is the most complete 8th AF group I have seen.  I chase 8th AF medals and really like this.  Thank you for sharing!

Sorry I cannot help.  I have a loose Sperry gyro.  I have never seen one in the box.  The graphics are really neat.    Sperry was massively important for the war effort.  Interestingly the Fritz Duquesne spy network had infiltrated the plant prior to the war.  In fact, Germany had a copy of the ultra-secret Norden bombsite blueprints before our entry in WWII.   Again, I really like the box!

Looks like you’ve got some nice Civil War swords.

love those hedgerows, it’s the Normandy Eve.

Great display!  I have always found the pigeon communication interesting.  Thank you for sharing!

You sure that’s even a Mitchell cover??? Great salty helmet.