Hi Peggy,
I happen to have a Sherri's Fireworks Clad Brothel strike and I noticed that the Clad ones have a smooth edge with no markings.
I also have a Sherri's Miss Spring Break, .999 Pure Silver and the .999 ones have a partial Reeded edge with the .999 markings on the edge.
The Certificate of Minting incorrectly states a smooth edge with .999 Pure Silver.
Aside from the markings, is your Fireworks .999 partially Reeded?
I hope this doesn't add to the confusion and that all is well with you,
Gene C