✅ SOLVED Need help getting a date off of a Railroaders button

[eyemustdigtreasure]

Need help getting a date off of a Railroader's button

I found a two-piece, gilt-covered, brass cuff (Southern Pacific RR) button. (see attachments of both sides)
I didn't get into aggressively restoring the back, as I saw aquachigger video on using Aluminum Jelly, but there
is enough of each letter, to see

"W.S. MANCKE & Co." on the back....but NOT the place of manufacture, no indication....(see?)

the little internet research I did, found the company making buttons for the police force of San Francisco, around (1907?),
AND the last attachment, shows and example of another one of their buttons, with San Francisco, Cal, across the bottom of the back.



So, How Old Is It?

 

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[TheCannonballGuy]

According to the book "American Military Button Makers And Dealers; Their Backmarks & Dates" (by McGuinn & Bazelon), W.S. Mancke & Company was a San Francisco firm in business from 1907 to 1947, dealing in "military and society goods." It did not manufacture buttons, it was merely a dealer of them.

 

[eyemustdigtreasure]

thanks, I didn't have much to go on, and dating the item
was my issue. (Solved)
And, after discovering a picture of the back-mark on the Internet,
now I know about the little star, at the bottom, center
- which in the button world, means "San Francisco", I guess.
Appreciate the input!