NOS AC Delco Air Filters A212CW AND A212CX

[1969camarors427]

I bought these filters at a swap meet and the filter number is 6424613 and A212CX.
There are 2 different style boxes. The one AC box has on it Pontiac V-8 400 428 4BBL Hi Perf Engine 1967. The other 2 just have the numbers on them.
When I remove from the box The filters on the top have A212CW embossed into the filter but almost like a branded X after the CW. These 3 have a Diagonal square screen with a almost soldered mesh and a finer mesh (like a screen door)behind the diagonal one.
What is the proper style of mesh used in the 427 vette engines ect... I have found lots of info but all different info on what is correct. Thanks