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Wondering what the exact moment was that Rob started producing the S2 Matrix. Cause when I peek at the catalogues section I find a French and English review, both from '91 about the introduction of headed basses. But on page 5 of Brochure 4 (which is from 1988) there is already a choice given between headless and headed. So now I'm a bit confused. Btw: my S2 matrix has serial 104. However I don't quite understand Rob's procedures, while there is an old warranty with the bass with all the specs of it, but........without the date of completion. Strange, isn't it???