Howdy Richard,
Your early one is from the first regular production run of 897, which began at serial number 409802, according to Dr. Jinks' book.
I believe those early ones are worth at least $1,500 as yours is displayed.
The next one is from the second regular production run of 3,000 (same source), and those are running in the $1,500 range, as well.
Best of luck if you choose to sell them. They are historic.