Thanks, Two Flints, for the photo posting.
Yes, and thanks DJ:
It is close to a Romano, but the Romano lube groove is approx. .175" wide.
The Accurate #51-320S is also close, but its lube groove width is greater at approx .130".
Larry likes a single wide lube groove. My four moulds of his 315gr. 56-50 are that way.
Except for perhaps a couple designs (I know of one in .54) involving a custom design for a single customer, not me, that insisted it not be shown in the Catalog, all others are in Accurate's Catalog. So my guess is that it is probably not from Accurate.
To me, the narrow lube groove is the key.
It seems to me that someone went to a lot of effort, yet used a narrow lube groove.
It took me years to piece together the Romano bullet mould story that includes Larry not making his Spencer or Maynard moulds. He designed the bullets and a fellow in Rochester, NY made the cherries and Romano stamped mould blocks for Larry.
That person has vanished, with Larry's equipment.
Ballard Rifle Co. made some custom 50 Sharps moulds that are also close to Larry's, but also with the wider lube groove.
All the best.
El Supremo/Kevin Tinny
Edited for a typo. K