This is a custom Marin Spivack setup vintage piece that starts with the same blank used for the Dukoff/Zimberoff “House of note” Supersonic model. This blank was used by Zimberoff, Selmer, George Bundy, and several others names as well from probably the early 1950’s to the 1970’s. It is a very good blank very much akin to the Otto Link Slant signature Tone Edge of those time periods. It has a round chamber with scooped walls and yet not an extremely large chamber, which is why (if setup properly) they will have a similar power to a Slant Link or a straight sig FL Link.
This is the later version of the blank which features a slightly longer shank, as the early shorter ones tend to play a bit sharper and have to be pretty far out on the cork. This is the same inside (and mostly outside) but solves that issue.
This one was custom set up from the ground up to a tip size of .100 and a medium shelf baffle. it plays with a very fat and solid booming tone with just the right amount of edge for clarity. I would say it may be a bit brighter than most stock Florida Slant signature Links, but I would not consider this extremely bright either, a very nice balance with a lot of clarity and a solid tone one can lean into.