Willie Mays auto'd ball question

I picked up an auto'd Willie Mays ball, the listing described it as a stat ball which it isn't. On one side the ball appears to be laser engraved with "Willie Mays Hr #626/660 09-Sep-70 vs. Houston Dierker". My question is was there something significant about HR #626, or did a company just engrave and issue a bunch of ONL balls for each of his homeruns? Thanks for any info.
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