I have a Buescher TT Tenor 1924 by serial#. The finish of the sax is a dark color gold. What is the sax during this era made of? Just curious. The sax is in great shape, no dings or dents and sounds fantastic. I beleive the sax was only used for a year and put up for storage and the finish just turned dark. Is there a polish that can be used to bring back the shine?