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Alfred,
I believe, the A serial (P serial as well) is the first year of SEL and there will be "no slots" in the back of the SEL for the springbar tool. These slots were put in later and are redundant if you have lugholes.
I would guess that rolex later decided to combine the slots with lughole to avoid problems of putting a no slots bracelet in a case without lugholes...the bracelet would then have to be cut off.
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