Hi Darren, I'm going to plead ignorance, because my knowledge of cacti isn't extensive. I'll ask a few other more knowledgeable growers if they recognize it.
It does help if you can tell me more about your geographic location (country? Hemisphere?) and your gardening zone if you are able to grow this outside, and where you got it. Sometimes these factors are critical to identifying a particular plant with any kind of certainty.
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