They were not submitted to a trial board. They were purchased by the Army.
It appears to have been reamed to accept 38 Special ammo. That is seen fairly often.
They were originally chambered in 38 Long Colt, which does not let a 38 Special seat fully.
Have you tried a 38 Spec in it?
If reamed, it should still bring $1000-1200.

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Regards,
Lee Jarrett