The piece at the bottom of the page is a "New Vintage (Florida) Slant". It does not say "Eburnated Bar", and as far as I know there is no "New Vintage" copy of the Eburnated Bar.
I found this page at Saxophone.org:
https://www.saxophone.org/museum/mouthpieces/model/183
Clearly enough, both designs can be found among the alto Eburnated Bar Slants: the larger chain with the "oval elements" or the smaller chain with "circle elements". Quite mysterious. Maybe Theo can help. I will write to him.
The Sax org link includes this:
"Charecteristics [sic] of New York Slant Signature:
Otto Link stamp at a Slant
"Otto Link & Co. New York" machining around chamber
Facing stamp on bottom of the table
Circle chain band around body above Otto Link stamp"
But post one shows both a circle chain and a link chain on a NY slant. Both include the eburnated bar inscription.
Over the years, hard rubber otto links which have a chain inscribed might show a large circle link, a small chain link, or a large chain link.
The NY slants do not show the smaller chain link. The New Vintage Floridas show a large chain link just as one of the Eburnated Bar mpcs from NY does.
(Summing up attempt.)
Theo has a chart for the metal links. Seems like one would be useful for the hard rubber ones as well.
Is there one out there?