I do not use the word UNIQUE lightly. This mess set is unique in my experience, which is saying a lot. It is the only one I have ever seen or heard of. I have no idea who made it or where.
The similar Milligan patent sets are incredibly rare, yet I have owned two of those and seen a handful more. Those sets have brought as much as $5000. This ingenious kit is completely void of markings or patent dates. The Union Army officer-s name and unit written on the carrying case are the only words to be found. I bought this decades ago directly from the descendants of the Yankee officer.
This set is made for use by three men... likely meaning intended use by company grade officers. The Captain, 1st Lieutenant, and 2nd Lieutenant would dine together apart from the enlisted and NCOs.
This is like having a complete kitchen stuffed into a tin pail. All the items fit neatly together inside the canvas and leather carrying case.
You have a portable wood stove, frying pan with removable handle, grill grate with removeable handle, 3 coffee cups, 3 saucers, 3 soup bowls, 3 dinner plates, 3 large tin drinking cups, a large soup or stew pot with lid, atea kettle with hinged lid, a coffee pot with lid, salt and pepper shakers, 3 curved tin boxes for condiments and silverware, and more.

Materials, Packing, and UPS Shipping on this item is $75.00. Insurance is $1.50 per hundred. UPS charges $5.25 for the signature required service.

Excellent