I'm not sure about the 4 digit number, but a lot of mfrs use a 4 digit code where the first 2 digits is the year and the next 2 digits is the week of the year, so 1213 would be this year (12) 13th week, so manufactured in early April 2012. I just bought one from Harvey Norman and it is also a 1213 machine.
I used mine the minute I got it home. It grinds fine enough for me. Fluffy clumps about 4 click away from finest on the beans I'm using up at the moment. It is very easy to use and the default shot setting gave me about 11gm of coffee plus or minus a bit as my kitchen scales are not the greatest. I'm not a real coffee snob though and just have an old Sunbeam EM2300. I haven't looked for shims on the grinder, but I will be careful when I remove the burrs to clean the machine.
I used mine the minute I got it home. It grinds fine enough for me. Fluffy clumps about 4 click away from finest on the beans I'm using up at the moment. It is very easy to use and the default shot setting gave me about 11gm of coffee plus or minus a bit as my kitchen scales are not the greatest. I'm not a real coffee snob though and just have an old Sunbeam EM2300. I haven't looked for shims on the grinder, but I will be careful when I remove the burrs to clean the machine.

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