ID help please

[Kamos]

Just picked this up this morning, and of course no label.
Looks like a Gymno to me but not sure. Any ideas?

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ps, it's about 2 1/2 inches in diameter, thank you.

[vlani]

I'd think Gymno too.

[Benyellow]

could be gymnocalycium schroederianum

[Kamos]

Thank you Ben, I think you might be right. It has buds now, so hopefully flowers
will confirm it in another week or two.