Is this a standard 21" Model A wheel?

[walkerlakeprinter]

Can you tell from this photo if this is a standard wheel and not an AR?
This is my spare wheel I am working on.....very badly rusted rim, but I'm
smoothing it out with a airtool scaler and an angle grinder. I have a rubber
protector that fits down in the rim, but I am smoothing everything out so the tire will slide on better than the struggle it took to get it off!