Need help identifying Navigator's Briefcase

[Flyhalf_Keith]

My dad turns 85 later this month. He is a retired USAF O-6 and a Master Navigator. While looking to get him a new Type VIII or IX briefcase for his birthday I stumbled across the bag in the attached image. I remember from boyhood he had a case like the one pictured but I am not sure if it was standard equipment or a private purchase. Does anyone know it's provenence? A Manufacturer or contract number would be the ultimate information! I saw this on etsy and it has the name of a USAF Captain marked on the top. The seller saw no stencil on the inside like most military bags will have

Note to admin: I had erroneously posted this earlier in The Front Parlour but I am not sure how to remove it.