I've actually seen the same knife & stamp previously (and there's one currently for sale on eBay), so I'm pretty sure it's not a factory error or missing some dots. I have also seen the M1059L pattern with two other style date stamps, one was a 1995 and the other one was from the 2000 era, so my best guess for the date of your knife would be between 1990 - 1994.
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