Well, to be honest. I was and am wearing signature since the day the merit was introduced back in January.
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I won't dispute that you have been on a signature the whole time since the merit system was started, but weren't you in a different signature campaign in January/February, as compared with the one that you have now?
IIRC, it was the Yahoo8675309 campaign, or whatever those numbers are after Yahoo's name.
(don't ask why I remembered that - I'm kind of surprised myself...
)