unknown little guy about to bloom for 1st time

I got this from a friend who did not know what it was... He grew it from unknown seeds. He said, all he knew was it was a Mammillaria.

Anyone recognize it? I know the spines are a bit damaged. Some are short, some are bent and it looks like it's developing hooked centrals.

I don't know... Maybe it's too young to Id yet.

I'll post a few more pics when these buds open. Unfortunately, I'm not at home and took a few plants with me that were about to bloom. I also don't get much sun on the balcony here. Nor do I have a photo editor so, Apologies.

Oh... let me know if you need a different or closer shot.

This plant looks like little M. zeilmanniana.

A member of the Styothelae for sure but it is far to small to be albe to put a name to it. It could be zeilmanniana but could a lot of others has well.

I'm guessing a picture of a flower would help?

Ok... One flower opened this morning... Does this help?

I think Leszek called it correct when he said zeilmaniana.
I have not seen zeilmanniana with a field number for sale before, althought I do know that Roman Stanlik has made a collection of this species.

Great! Thanks Guys... One more pot with a label.