Posted by Brian Frederiksen on June 01, 1999 at 07:53:30:
In Reply to: York Sousaphone posted by Frank on May 31, 1999 at 18:56:22:
John Swain has a site about York at http://web.calstatela.edu/faculty/jswain/brass/yorkcov.htm
There is a table of dates and serian numbers.