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Front left A5
Back left A21
Front right A40
Back right A37

So if the above are all 'Prefix' numbers as shown this puts the Doctor's example into the late 69 into 1970 production period.

Ghosthunter.

Yes, it’s strange. That’s how the original looks on my Mac, but the board software seems to take out half a stop of exposure on posted images. I didn’t bother to go back and edit this time, though I often do.

Thanks for the date information - brilliant. That ties in with the published dates for an early Group 6.