Hello, This a 3/4" Chain Repair Link, sometimes referred to as a Missing Link. I am trying to figure out the lettering "BTC". I could not track it down, only thing I got on the web is that BTC now refers to Bitcoins!!!.Regards, Lou
I believe that BTC stands for Brewer-Titchner Corporation. I searched through Google and followed links so I think I'm correct. It looks like they're closing down now.
Here is a link to some information about them.
https://www.wxhc.com/?p=4136
Hope this helps!
Bill D.
Hello, Bill. Thank you!!!! Regards, Lou