Vintage Kopper King Spark Plug

This is Kopper King Mfg by the Sharp Spark Plug. Sharp Spark appears on the body and there's additional marks, but I can't quite make it out. It weighs approx. 5 ozs.
The series of spark plugs currently up for auction comes from a collector's sale. I'm no expert so I'm relying on questions. Thanks.

Please let me know if you have any questions or would like additional photos.

I pack carefully and ship via USPS, Priority or UPS Ground. Shipping is generally within the U.S. only. I will ship international to those who have established good feedback and write to me in advance agreeing to any additional shipping costs. Items will be shipped as soon as possible, usually within 1 business day upon payment. I will be glad to combine shipping on multiple purchases when possible. In this case, please wait for an invoice from me and disregard the Ebay generated invoice at the end of an auction.

Thank you very much!