So I have a Super Olds Trumpet that was my late husbands and I am looking for some information. So far I have found what appears to be the serial number on the middle valve. Serial number is 530171. Near as I can tell it is a late 1960's early 1970's. It had the Fullerton, California USA stamped on the bell along with the words Super Olds By F E Olds and Son. Is the information I have found accurate so far and if so does anyone have any idea what this would be worth? Thank you in advance for the feedback.