"I have some cartridges marked ".38 LONG." No Colt, no S&W. Don't have the box they came in, so I don't know what the box says."
That's because there was only one .38 Long produced in the United States -- the .38 Long Colt.
Smith & Wesson never had a round similar to the .38 Long.
With both S&W and Colt manufacturing cartridges known as .32 Longs, you had to be more specific.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.