Since the dates on the box on the EBay one go up to 1978, I would guess the EBay one is from 1978 or 1979.
I also have never seen any postings where original A212CW's were embossed on the top. Everything I have seen says that the original A212CW's had white silkscreening starting with "BEST WAY TO PROTECT" on them.
I think the Corvettes were similar and I found something on the "Corvette Restoration Guide, 1968 - 1982" by Richard Prince.
“All 1968 and 1969 Corvettes not equipped with an L88 or ZL1 use an open element air cleaner assembly. The assembly is comprised of a base, an element, and a lid.
……………etc etc.Original air filter elements have ‘BEST WAY TO PROTECT YOUR ENGINE – REPLACE WITH TYPE A 212 CW’ silk screened in white around the horizontal lip.
Furthermore, original elements, unlike later replacements, have a fine wire screen around the outside. Most replacements use a noticeably heavier wire. Earlier cars probably utilize an element with the wire screen in a diagonal pattern. Later cars probably use an element with the wire screen in a horizontal pattern. With a horizontal pattern, the wire forms rectangles with the longer measurement running vertical when the element is installed.”