<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">Wikipedia says bare aluminum discs started in late 1920s.</div><div dir="ltr"><br></div><div dir="ltr"><a href="https://en.wikipedia.org/wiki/Aluminum_disc?wprov=sfti1">https://en.wikipedia.org/wiki/Aluminum_disc?wprov=sfti1</a></div><div dir="ltr"><br></div><div dir="ltr">Kevin</div><div dir="ltr"><br>On Nov 4, 2021, at 10:40 AM, Kevin P. Mostyn <lists@mostyn.com> wrote:<br><br></div><div dir="ltr"><span>Let’s let the original poster clarify his disc. I’m not sure when embossed aluminums first were used. I have a bunch from the mid 1930s that I had Ward Marston transfer. He used standard styli.</span><br><span></span><br><span>Kevin</span><br><span></span><br><span>On Nov 4, 2021, at 10:36 AM, Scott Dorsey <kludge@panix.com> wrote:</span><br><span></span><br><span>That seems early for an embossed disk. I have a giant ball stylus that</span><br><span>rides on top of the groove for embossed plastic discs of the forties,</span><br><span>but I have never tried it on embossed aluminum.</span><br><span>--scott</span><br></div></body></html>