[ARC5] Type 185 Radio Receiver?

[Tim]

A friend surfaced one, NIB.  Few details but he is interested in its
function.
Receiver is a cube shape, cabled to a battery box underneath which includes
a carrying strap. Black wrinkle paint.. Does not look to have a shock
mount..
It carries a contract number NOa (S) 185, the (Navy?) manual is dated 1943
but does not look "military"..

I'm guessing a portable NDB Nav receiver possibly for ferrying aircraft.
Sorry, no other identification details.

Any ideas on this minimal description?  Thanks
Tim
N6CC
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