The threaded inlet is 3/4 inch. It measures overall just at 10 1/2 inches tall. The bell itself is just at 6 inches long. It reads L CO on one side of the bowl and 200 on the other side.
The acorn nut on top does have some pipe wrench marks as commonly found on steam whistles. There is no damage or dents to it anywhere that I can see.
This whistle works great as I tested it on my air tank using a ball valve and at 60 psi it is very loud and mellow. The item "3 Antique Lunkenheimer Brass Plain Bell Steam Whistle for Traction Engine, etc" is in sale since Thursday, July 11, 2019. This item is in the category "Collectibles\Transportation\Railroadiana & Trains\Hardware\Whistles, Bells & Horns".The seller is "rareitem" and is located in Maynardville, Tennessee. This item can be shipped to United States.