Yes, the "S" cane is one that was first noted in some Strathearn items. But later, the same cane was also found in some weights that checked out under UV light as being pre-1956 (i.e. not a lead based glass) and therefore very likely to be an "S" for Salvador Ysart.
Edited to add: I have added extra info to the thread for the "Star pattern" weight linked to by Gary.