Thanks for the link.
I did find the manufactor's marks on the propeller, and was able to go to their site to see if I could match the serial numbers with a table on one of their pages.
Didn't pan out so far, but once I decipher the identifying marks & the table information, I'm sure I will be able to make a match!

Here's the marks, which I still have to decipher:
SENSENICH
PO No.1
T.O. No. 586
85R 5 61
CS-S (I think it says that... that line was hard to see)
Nope, I don't have any idea from when. There is a thin metal strip on the leading edge of the props.