Here's Bing's response:
Hi Keith,
I built two boards with the number 7511, one in 1967 and a second in 1971. The reason was when I reached board #10749 in 1968 I decided I didn't like having 5 digits in the numbers so I started over with number 1,000 at that time.
Your board was built by Matt Calvani who I turned over our board construction to in 2000 and he has used his own numbering system. He also has started over at one time to avoid using 5 digits in his numbering system.
Hope this helps.
Bing
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