I found one of my generator Pictures showing the residue from the original yellow radio bypass sticker.
I had three of these and they all showed evidence of the sticker. Most restoration suppliers show the round red sticker which is correct for the earlier cars. I do not exactly know when the yellow sticker was introduced. I swear I saw an underhood photo of the 59 Gagnon death car and it had a yellow sticker.
The new authenticity manual for 61/62 does make mention about the debate of the yellow sticker.
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There is a red round one and a yellow sticker on my 1958 which was purchased new by my dad. If you need a closeup as to what it says, let me know: