For your Craigslist consideration today here's a vintage Mopar flywheel for their flathead sixes, 1935 thru 1959, for $150 cash FOB Pomeroy WA.
146 tooth.
8-bolt crankshaft flange hub.
41 pounds, 14 ounces as you see it.
~14.6" outer ring gear diameter.
Nice, serviceable ring gear.
Machined surface shows some flash rust, and no grooving; formerly an industrial stationary engine, no friction disc has ever touched its surface (this one had a bolt on PTO splined adapter disc bolted to the flywheel). Have your favorite machine shop cut a fresh face, and you'll have a long lived flywheel!
Neutral balanced; all Mopar flatheads were internally balanced from the factory.