1968 T code 200 cubic inch 6 cylinder with manual transmission.
Typical core valve, will not function. Basically selling a non functional smog part with a desirable date of 12/16/1967. This valve has the date stamped so that it may be visible when looking at the engine. Many do not have a visible date when installed.
Could also have a casting number of C8AE-9B289-A, the covers on the valves do have date codes imprinted along with the Carter valve number 4489-S.
Ford part number C8AZ-9B289-A.