I came across these on our farm, we got them along with a roll of stainless whenever the factory was being cleared out for some ss to fabricate bits and pieces with.
They have been sitting about for years though forgotten about hence they are starting to markup a little. Not sure whether there is more interest in them as a full sheet or whether it is better for me to get them machined out where the stamp is and maybe mount them.
They seem to be the complete stamped section of sheeting ready to be rolled and formed into the exhaust.
If anyone is interested let me know as there is a limited supply.
Alot of the marking by the way does actually clean off pretty well although not always perfectly. Most of the areas that are stamped are good though.