I'm posting this here because I just realized it ties in with Kyle's incredible pennant research...
https://pennantfever.weebly.com/blog.../trench-mfg-co
I picked up this duplicate because it is a tough and unique pin and I couldn't pass it up for 10 bucks. I just now noticed the Sportservice "Double S" mark. Of my 800+ Giants pins, I think this is the only one with that mark...