Stretching the memory! It would have been the late 1950s. The 3 letter - 3 digit yellow series started about 1950 and they were certainly up to DAA-xxx by 1964.
Another clue could be that in 1961 there was a colour change from a "yolk" yellow colour to the lighter yellow that remained for the rest of the series. So yours would probably be that darker "yolk" shade of yellow.


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