I'm not sure how much fracs prove the point. Making fracs solid is kind of a no brainer because it's cheaper to produce them that way, and edge spots make it easier to count stacks from across the table - who cares how many fracs a guy has?
Its interesting though, because the reasons you wouldn't put spots on fracs might be the same reasons behind spot progression. But that doesn't make it so. Look at the Lakeshore in chips - solid fracs, spotted other chips, but no progresssion at all.
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I haven't been in this hobby for 30 years, so I don't know what people were talking about, back in the '90s or earlier. It just feels to me like all this progression talk is stuff created by chippers, and I'd guess recently. If somebody can show me a Paulson catalog or any chip company marketing materials, or anything in print at all, that ever discussed spot progression, maybe you can change my mind.