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It looks like a very early service dial. .
I am not convinced this is not an original A5 dial. There is clearly a ring around the dial where step should be, and sometimes the step can be worn down from service. Also, age spotting as noted by Tom.
Is this a private or business seller?
If you're not actually interested in the watch, I'd say it's approaching bad form to have the seller running around taking and sending extra pictures when you're just curious and have no interest in buying.