The biggest clue is no barcode and (unless it has been changed-out) a smooth-sided case. That tells it apart from the UK silver-face which is very similar otherwise.
It gets even more bonkers complicated/geeky in that within the subset of Japan for UK ‘black face’ DSOTM you can apparently have both ‘non-TO’ and ‘TO’ matrixes, and get this, they are both the same (Sony) mastering, i.e. both the same as the first crazy valuable Japanese ‘black triangle’ ‘non-TO’. Details here on
Pink Floyd Archives. My copy is the first ‘non-TO’ issue.
You need to be wary of other nationalities too, e.g. I’m pretty sure the West German ‘black face’ is the same as the ‘TO’ ‘black triangle’ and ‘silver-face’ UK, i.e. not the quiet pre-emphasis ‘non-TO’ mastering.
PS For clarity: subjectively there is absolutely no way in hell anyone could confuse the ‘black triangle’ ‘non-TO’ with the ‘TO’ (same as UK silver-face). The latter is about 5x louder and way brighter, i.e. if you swapped between them without adjusting the volume you’d be buying new speakers and likely ears!
PPS My ‘black triangle’ is this one (
PFA). This site is very good as it gives levels, so you can see it appears to be the same as the UK silver face (it is) and also the German black-face.