For your consideration is this vintage Leeds & Northrup test set type S.
These units were used by the U.S. Army, though this particular one does not seem to be marked as one of those lucky few.
This is housed in a wooden case. The case had a leather carry strap, however this has broken at some point and is missing. The top of the box is painted black and marked with R-45. The front of the box has a lockable latch but no key. This measures about 9″ x 8″ x 6″.
The unit has the original paper instruction label located under the lid.
The unit has not been tested and is being sold as is.
Please see photos for more detail.