JB and Thunderbird hallmark

[wwwamericana]

Do any of you recognize this stamp?
I think the T-bird may be a shopmark and JB the artist. Nothing terribly expensive, just like to know whatever I can on my pieces.

[Steve]

can you post a front view

your stamp resembles this known stamp but…

[wwwamericana]

Posting some pics of the bracelet.
Thanks Steve for your help