Is there a way for me to sell this?

I have in my possession something that resembles some kind of a military explosive weapon. I don't know if it is--the markings say "AT GR 75 PRAC LOT MA 12-52. REV .25 LOG W."

Here's a pic. I Think it distinvely falls under the not permissible items--any suggestions. Honestly, if it is an explosive, I certainly don't want it in my house and I'd rather sell it to someone who does.