[Milsurplus] BC-9 Radio - Paint Question

[David Stinson]

A question for those of you who have worked with
WWI and 1920s mil rigs (Hello, Mike M?).

I'm carefully photographing, measuring and documenting
the original paint finish on my 1921 BC-9 Infantry rig
with its 12th Infantry stenciled marking. 
The original paint, several overcoats and markings 
are crumbling away and about 70% gone:
https://goo.gl/photos/iWBcaJkZQi9uotRw9

I intend to remove the remainder of the dead paint,
repair and condition the wood and "furniture" and 
refinish the cabinet in its original unit colors.

Under the flaking and chipping paint, all the outer
surfaces seem to have had a first paint coat of
some sort of red- cabinet, furniture etc.  All have
the red undercoat.  Was this some type of primer?

I removed one of the strap hangers from the side
of the cabinet both to repair it and get it
out of the way of the cabinet repair/refinish.  
The inner side of the hanger, pressed against the
side of the cabinet and thus not slapped with the
multiple coats of goo applied over 96 years, has the
red undercoat and a single coat of olive drab.

Here's my main question:  The "olive drab" under
this hanger is a different hue than that common to 
WWII Army O.D. or the "Deeper green" of  
Marine Corps O.D.  This is a lighter, "dusky-er"
O.D. hue with a hint of brown:
https://goo.gl/photos/ZUS37Uy9EqWF2rHv6
https://goo.gl/photos/WXkZPZPkUEoSGxQo8
Is this O.D. hue "correct" for WWI - 1920s 
Army gear, or has the color oxidized over 96 years?
Seems a lighter shade of that used on the early 
BC-474 rigs.

TNX OM DE Dave AB5S