In a message dated 9/20/2006 1:07:05 PM Eastern Daylight Time, lubun at comcast.net writes: > Some are 12" discs, some are 7", many are single sided, which leads me to > believe they may have been demos issued to review or broadcast before > distribution > ********** Hi If the single-sided discs are Vicor Red Seals, then that's the way they were issued, and kept so until Sept 1923. Patent dates do not refer to dates of manufactore. Hence none of yours (with paper labels) were made in the 19th century. Allen www.phonobooks.com