Unknown cactus with berries

I know it's a Mammillaria but I don't know the species.

 

Never been good at iding cacti unless there is any thing that is particularly different.

 

It looks like a Sulcorebutia arenacea or similar.

 

What colour were the flowers.
Looking in my book it could be M. schiedeana or M. prolifera, possibly a variety of.

 

Thanks, it is very similar I agree

I didn't see them, the berries were there when I bought it a few weeks ago.

Not that one, I've already got that one and it's not the same

Thanks, it could be, it's simmilar.

 

@Michael Hewett very nice plant Michael, hope you get an ID soon, I believe it to be a Mammillaria but which one I’m not sure

 

I'm pretty sure it's the famous Mamillaria sp.

Anyways, it's certainly a beautiful plant. Are you planning to sow the seeds @Michael Hewett ? The fruit look very tempting.

 

I believe it is Mammillaria elegans.
I may sow the seeds if they ripen but I have never has any success with cactus seeds. We'll see what happens