Identify a bottom bracket on a 1989 Raleigh MTB

Hi all. I'm trying to identify this BB before I buy this bike. It's a 1989 Raleigh MTB. Image is from the seller and am not sure if it's skewed, but it seems like quite a big diameter, square taper. Would like to know if I can replace it if knackered. Many thanks!

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Old BMX bottom bracket with square taper spindle? Is it a Raleigh Mustang?

Something like this looks like it:

https://www.ebay.co.uk/itm/322398352185

(old 3-piece cranks in a 1-piece crank shell)

It is indeed a Mustang.

One of these might work - US to Euro BB (Euro is BSA in the BMX world, right?)

https://alansbmx.com/collections/bottom-brackets/products/american-to-euro-bottom-bracket-adaptor

Otherwise, you're into one-piece cranks - proper old school!

Great, thank you @c00ps! So these are old American style BMX bottom brackets? It seems like there are some threaded ones and also pressed-in ones (https://www.sheldonbrown.com/harris/opc.html). Mad! I suppose I won't know exactly what it is until I buy it but replacements are possible. Also seems to be highly serviceable so maybe shouldn't be too worried.

I'm left wondering why there's a US BB shell on a retro British bike brand?

US market? (Raleigh sold over the pond also)

Copy of american klunker? (slack headtube, etc.)

Some other only-known-in -Nottingham reason.

Who knows? Maybe this was the betamax of bottom brackets?