As far as I can tell the date range for LWC's is from the mid 1920's (25?) to the mid 50's (56?). And though not exclusively, they are listed among other known doubled dies on http://www.doubleddie.com and http://www.coppercoins.com. I am not familiar with a listing of just doubled eyelids. I hope this is helpful.
Thanks Sudz - it is. I had found a 1996 I thought could be a candidate and did not know if any had been found on copper plated. I decided it was zinc rot instead!
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