Threaded end on a brace-type auger bit

[Eurekan]

I was going through an old pile of auger bits looking for one to fit my power drill and ran across a unique specimen. This 18" double-helix auger is equipped with a brace end but also has a threaded portion. I've looked closely but cannot find a maker's mark or brand. It seems to me the thread is manufactured in rather than home built because the brace taper looks complete. I only found threaded drill bits referenced for impact usage and I don't think this is that. 

Anybody got some more information on what this is intended for? Worth anything?
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[MT Woodworker]

Is it possible that someone threaded it for a specific purpose?

Obviously not as old, but treaded drill bits used in aviation a lot. 10-24 was the thread size for most of them.

[bandit571]

Or, they can then be threaded into a "T" handle..

[Roly]

Or, they can then be threaded into a "T" handle..

That is it.  They are called a barn auger bit.    Normally the square taper was forced into a hole in the handle and pulled tight with the nut.  Roly

[andrewb]

That is it.  They are called a barn auger bit.    Normally the square taper was forced into a hole in the handle and pulled tight with the nut.  Roly

^ This - a bit that large needs more leverage than your standard brace can deliver comfortably so T handle can make the going a little easier.

[Eurekan]

Or, they can then be threaded into a "T" handle..

YES! This being a barn auger bit on a handle makes complete sense.  I don't need to use that but will display it.