[Milsurplus] Tool Box question

[Ray Fantini]

I am trying to get a date or any information about a tool case that belonged to my step father from back when he was in the service. The relevance being is this something that he used back in the early days when he enlisted in 46 and it was still the Army Air Corps or something from back before he retired from the Air Force in the early seventies. He worked as an aircraft mechanic before becoming a flight engineer and suspects that if this box is old enough it may be from that time.
The data plate lists it as:

CASE, TOOL MECHANICS
TYPE II
SIZE 2
MIL-C-3152    N600s-X-7344

I know that MIL-C-3152 refers to a date of 15 March 1950 but that has little bearing on how long they may have been in production and distribution. If this same box was in use in the sixties and seventies it may have just been one of the many things that he picked up in thirty years of service. If it is a late forties or early fifties period box have thought of restoring it and  may try  to locate period tools and the like for it. Been painted so many times finding original color and the like may be an issue. If it is correct for that early date wanted to go ahead after repairing the metal work and repainting and stenciling on the name, rank S/N and his old unit at that time the 509th Bombardment Group and the eighth insignia. He was always particularly proud of the time spent in the 8th.
I know it's not radio but restoration is always interesting.

Ray F