For anyone that has an interest in oil filters...

[70 copo]

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In January, 1970 the PF-29 was discontinued from SERVICE and replaced by the PF-25. However, BOTH the PF-29 and the PF-25 were released and existed PRIOR to the time that they replaced the filters that they superceded. The dates given above are the dates that the last GMSPO inventory of the earlier filters "went out the door".
Just to add,I see the white PF-25 #6438261 filter specified as being in effect for the 1969 Corvette as late as March 1st,1969.

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This is good information. I have an NOS PF-25 Embossed White oil filter GMP#6438261 and it has the following screened into the side:

"The efficency and capacity of this new oil filter with ACRON filtering material and unique "W" fold exceeds that of the longer PF-11 or PF-29 it replaces"