I just checked the September 1930 parts book from Yokohama. There are no AF parts listed anywhere in the parts book. Here is the listing for cylinder head gasket, for example (highlighted by blue arrow) with only the A engine gasket listed:
However, looking at the Ford "Export Dealer" parts price list from the Ford Motor Company of Canada from September 1930, it clearly lists AF parts, including AF head gaskets (see the blue arrow again). This catalog was for Nepal (between India and China for the geographically challenged):
The March 1931 Ford parts book from Czechoslovakia also lists AF parts including the AF head gasket. Model A's, AF's and their parts for Czechoslovakia were supplied from Germany:
Brad in Maryland