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The 11C was last produced in 1989. The first two characters indicate the year, so the 29 indicates 1989 production. The second two characters indicate roughly the week of the year. Would 2900 indicate it was made before the production crew came back from the New Year holiday? ;^)

Has anyone else seen an SN like this (XX00A)?

I see two options.

1. Week one could start with 0. Not uncommon to see arrays start with 0.

2. Model from Santa's workshop. You must have been a very good boy.