Just picked up this tungsten core today. Weight is 8.0 lbs (3.636 KG), it is 6.7" (170.8mm) long and is 1.892" (48.05mm) in diameter. The info on the base is pictured. Does anyone have any info on this core? By the lot, I'm thinking U.S., but out of what? Apologies for the pictures being rotated to the left. Thanks, Bruce.