Advice on buying an 8 reales cob

I have a small type collection of Mexican 8 Reales from the Pillar Dollar through the Cap and Rays type, plus a few of the early Peso types. I'd like to add a decent example of an 8 Reales cob, but I'm concrned about getting a fake, as it seems they'd be relatively easy to counterfeit. Any suggestions on what to look for? I don't want any rare varieties or a condition rarity, just a decent-looking example. My Pillar Dollar, for example, is an ANACS VF20, an I consider that decent-looking, since it shows the key details and has a nice original look to it.
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8 Reales Madness Collection