This mold came from a Swedish auction site. Not an ebay-type site but a high end auction site.
The auction description is in Swedish but its not too hard to figure out what it says.
Being a boolit casting forum I figured youse guys would appreciate such a contraption. I've never seen a gang mold constructed this way.
KULFORM, 1800-talets början, i stål för 30 st rundkulor med kaliber 18 mm
circa 1800, 30 stuck (each) round ball caliber 18mm... or close to it.
That's a big honkin' mold as 18mm is .70 caliber. I may have to have a Swedish friend verify that.