Lyman 518512, 1 Cavity 50 caliber adjustable nose pour mold (mould)

Description

This is a Lyman 1 cavity 518512 50 caliber nose pour bullet mold. OK, I have some cast bullet knowledge but am only guessing at some of this - I presume someone who will want this knows a lot more about it than I do. This is quite an interesting mold. It is an adjustable nose pour 50 caliber Ballard mold. I got it at an estate sale years ago.  Judging the size next to my 515141 you could probably cast between 400 and about 575 grains with it. It appears that you adjust the screw to align with one of the lube grooves to decide the size you want. It has both a set screw and a lock nut to hold the adjustment screw in place. I seem to recall reading that these were for paper patching but I can't confirm that. It would be nice to hear from someone if they know more about it.
It is from my personal collection which I am thinning out. It has been stored in an air tight container with desiccant.
I will combine shipping on multiple auctions to actual shipping cost.