It is a Universal Table Saw Jig, https://woodworker.com/universal-table-saw-jig-mssu-30254.asp
The Shopsmith Tenon Master Jig is similar but will have the narrower miter bar to fit the slot in the Mark V tables, and the clamping system is different. http://www.lhdigest.com/SS/MANUALS/OTHER%20TOOLS%20AND%20ACCESSORIES/TENON%20MASTER%20JIG%20555089.pdf
I have an older version of the Craftsman Universal Jig that works on my 10ER, which has a 3/4" miter slot.
Also check out this thread. https://www.shopsmith.com/ss_forum/community-f7/craftsman-universal-jig-t19565.html
10ER #23430, 10ER #84609, 10ER #94987,two SS A-34 jigsaws for 10ER.
1959 Mark 5 #356595 Greenie, SS Magna Jointer, SS planer, SS bandsaw, SS scroll saw (gray), DC3300,