Recently, I contacted David to ask him if he would share the story of how the pin came to be part of his collection and perhaps share a better photo.  He graciously responded and provided the story that follows as well as additional photos including a stereo photo of the stereo logo pin!

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Shown below are four photos of the pins. One in 3D taken while on a corduroy blazer. Two are on the original cards that the pins were attached to. There are two variations of the pin, and they were available in both silver and a gold color. One style had a short pin with a latch, like a brooch pin. The other style has a 7mm threaded post. The back screws on to the post, unlike all pins I've seen today that have a smooth post with a friction slip-on back piece to hold the pin. The post style was definitely intended as a lapel pin. The latch pin version was probably intended for members of the club to use on clothing that does not have a lapel buttonhole.  
 
We acquired several of these pins from Walter Heyderhoff, who was President of the Chicago Stereo Camera Club in 1970, and 12 Years editor of "Tips and Techniques for Better Stereo Pictures" in the bulletin of the Chicago Stereo Camera Club. (see bio below taken from http://www.luminous-lint.com/z01/photographer/Walter__Heyderhoff/A/).
 
He was also the "Equipment and Supplies Director" for the Stereo Division of the Photographic Society of America. In the early 1980s Susan Pinsky and I took over this position. At that time we purchased his entire inventory of supplies, which consisted mostly of stereo slide mounts made by EMDE and Realist, Inc.
 
Along with these items were a few of these lovely Chicago Stereo Camera Club logo pins, still on their original cardboard cards from the manufacturer. Since that time I have worn all of them on different suits and blazers, and they often are the source of a question about what they are. They are a lovely representation of a stereo camera with rays of light extending to a stereo slide, and I love explaining that they were made for the CSCC in the 1950s, and what it represents. 
 
David Starkman
Culver City, CA 
November 2021

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Walter Heyderhoff. President, Chicago Stereo Camera Club, 1970. For 12 years he was editor of "Tips and Techniques for Better Stereo Pictures" in bulletin of the Chicago Stereo Camera Club. He was almost always listed in the annual list of "Tops in Stereo". Many of his slides are in the Stereo Hall of Fame. He was an instructor in stereo photog. in the Chicago Camera Club Assoc. Fellow of England's Third Dimension Society. In 1988 he presented his 3D show, "Flowers Inside and Outside" at the PSA International Convention and at the ISU Congress in Switzerland. D. 10/1/1992, age 80, in Evanston, IL, where he had spent most of his adult life. His favorite stereos were of flowers, taken with a camera which he had put together with parts from a variety of old cameras. Member of PSA/SD, NSA, SSA, and Chicago Stereo Camera Club; honors, APSA 
 
T.K. Treadwell & William C. Darrah (Compiled by), Wolfgang, Sell (Updated by), 11/28/2003, Photographers of the United States of America, (National Stereoscopic Association)