Hi Chris.
I don't see anything which looks to me like it was from a mold.
These are handmade, from Germany, from late 1800's to early 1900's.
With only one view of this one, I won't say for sure, but from this one view, this looks like it could turn out to be an Akro corkscrew, from the 1930's.
Solid color marbles can occasionally be special, but they're usually considered "game marbles" and were made by many companies. What size is this one?