This concerns Bruner-Ritter, an official Gruen bracelet/band supplier. Part 1.
In 1914 Simon Bruner (b.Szaja Lajb Bruner in Będzin, Silesian Voivodeship, Poland, 1876)
and brother Herman acquire X. L. Jewelry MFG Co., NY, New York.
This is the start of S. Bruner Inc., manufacturer of watch attachment's, watch cases and ring's.
See several of Simon Bruner's patents from Teens and 20's here:
https://patents.google.com/?inventor=Bruner+Simon
In 1921 Bruner Watch Co is established.
In 1925 Saul Ritter marries Melrod Bruner, daughter of Simon Bruner.
In 1926 Simon Bruner registers Brunvil.
In 1927 Herman Bruner dies.
In 1931 Simon Bruner dies. The company continues under his son, Marvin Bruner.
In 1932 the concern is now know as Bruner-Ritter.
Photo of mark from an original stainless bracelet on guildite variant of Strap 266 from my collection.
And this is where the first known Gruen connections begin, with Bruner-Ritter supplying bracelets for ladies and gents models throughout the 30's, 40's, and 50's.
This clip shows indeed Bruner-Ritter as Gruen supplier, Sponsor, January 1950. And gets us up to speed on the decade this next post pertains to.