Is this aluminum cent an intentional error?

or is it tied to the production of the 1974 run for the congress members? the one sided strike leaves me confused and with lots of questions.... any thoughts or backstory?

https://www.ebay.com/itm/1974-S-Aluminum-Lincoln-Cent-Struck-by-Obv-Die-on-Philippine-1S-Plan-PCGS-UNIQUE/274369731651?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160908105057%26meid%3D278f6fcff8894a94b1d33e575cdd6e7a%26pid%3D100675%26rk%3D4%26rkt%3D15%26mehot%3Dnone%26sd%3D203123877105%26itm%3D274369731651%26pmt%3D0%26noa%3D1%26pg%3D2380057&_trksid=p2380057.c100675.m4236&_trkparms=pageci%3Ab432695c-1184-11eb-b8b5-2602d8e37829%7Cparentrq%3A3d81dc341750a688a3dc4093ffface2c%7Ciid%3A1

 

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If they know it was on the Philippine planchet, it may have been an intentional error, but maybe not.

 

Almost certainly a helped "mint error" considering San Francisco didn't strike aluminum 1 Sentimo coins for the Philippines until 1975 and then only as proofs and this appears to be a business strike.

 

There were a lot of "on purposes" made in SF in the early 70s. This is most likely one of them.

 

For those members who don't want to open the link provided -


And