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Say 1979, in any serial no. of a 6309-7040 is a 6 digit no. with the 1st 2 being yr & month, say 93xxxx. Then monthly production should be 9999 pieces for Mar,1979, the whole yr of 1979 shall be then around 120,000 pieces.
Anyone knows the annual production of Rolex Submariner by 1979 ? Tks
 

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I always wondered how much production info could be gleaned from Seiko's serial numbering system.

If they absolutely maxed out the production for each model and for each month within the confines of the serial numbering system, then I suspect that your production estimates would be accurate. But I doubt that is what happened. I suspect that Seiko adjusted production of each model from month to month based on sales of that model. Maybe in some months they made 9,999 casebacks (which is the only part of the watch that is serial numbered). But it is possible that other months they only made half or 1/4 of that. In other words, perhaps production broke down like this...

May, 1979--9,999 pieces

June, 1979---6,209 pieces

July, 1979---4,802 pieces

August, 1979---3,432 pieces

Sept, 1979---5,566 pieces

It is just hard to tell how many of these were actually made, but I do know from talking to people who purchased watches in this era that these divers were VERY popular when new. I suspect that they were made by the tens of thousands every year from '77-'88. Seiko can't (or won't) give us any info on the subject.

They must have been made in HUGE numbers because even after 30+ years of attrition they are still a very common watch. That can't be said for the Submariner, though it certainly is not rare as a model. There are lots of Subs around because they have been made for 40+ years, but I think in terms of yearly production they would be way behind the 6309. The 6309 was made in much greater numbers annually...but for a much shorter period of time. JMHO. ---A
 

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You also have to take into account that Seiko was making both the 6309-7040 and 6309-7049 so they could actually max out at almost 20,000 watches per month for worldwide distribution.
 
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