I have yet to see an aluminum Ford hubcap, and AFAIK, there were no chrome hubcaps, until Ford came out with styled wheels, then they used chromed plastic hubcaps (Ford: ornaments) on some of them.

At one time, Ford spun a stainless steel shell over steel hubcaps, then crimped the edge, but this practice 'went away' circa 1942.

1964 Galaxie, 1965/66 F100 Custom Cabs: C4AZ-1130-A stainless steel 10 1/4" "outie" hubcap with a raised slash thru the center with crescent shaped indentions, one above, one below the slash.

Has stainless FORD block letters within the indentations with the background painted black / Outie = so called because the hubcap snaps over tabs located on the outside of the wheels center section.

1965/66 Galaxie: C5AZ-1130-A stainless steel cone shaped 10 1/2" outie hubcap, plain center section, then with a indentation with FORD twice. Stainless vanes radiate from the indentation with black paint between the vanes.

1967/69 Galaxie: C7AZ-1130-A stainless steel sorta flat 10 1/2" outie hubcap with crown in center surrounded by black paint, has two black rings around the edge.

1970/71 is similar, but has no crown. 1972 is similar, but has crown and laurel wreath in center.