It's tibbe key? If you have discs (wafers) stripped and you're not sure, just look at the groove on it and compare with known - there's only lack of No. 2 so if groove on "D "will be positioned differ from groove on any other you have stamped then it will be No. 2. Maybe D will equal to No. 4 then groove will be in same place. I think you understand what I mean.
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