For your consideration one McKee & Mason 350 - Thomas handbook 175B - RoundBall to RimFire 337-339 Selma Arsenal bullet with the wide plug cavity. You will find this bullet to be in excellent dug condition. The patina is a real nice light brown color. Inside of the plug cavity traces of the original black powder can still be found. Also a series of nose cap rings can be seen on this bullet...see last photo. Measures about 0.575 x 1.01 inches.
See all 4 photos.