Vintage jack identification

[C1070RS]

These 3 identical jacks dont seem to have a brand name cast anywhere on them. Any opinions of what company might have made them and approx year?
They are approx 12" tall.

 

[Asport]

Looks like Ford Model A/T jacks

 

[Bill Wright]

They aren't Ford jacks.
Aftermarket?

 

[C1070RS]

I'll have to clean them up and see if there's any markings hiding under the dirt.....