What's the difference Speedmaster 3891.50.81 and 3591.50

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Both of these refs are listed on Omega's website as the SPEEDMASTER "MOON WATCH" 25TH ANNIVERSARY APOLLO XI - this is a limited piece 1/2500 with engraved case band and case back.

https://www.omegawatches.com/watch-...n-watch-25th-anniversary-apollo-xi-3591-50-00

https://www.omegawatches.com/watch-...n-watch-25th-anniversary-apollo-xi-3891-50-00

What's the difference or are they just different sequences chronologically within the 2500 numbered watches?

Thanks.
 
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Good point, I saw on one of those Omega pages it says, 'International Collection'.
 
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The .81 you mentioned in your title probably indicates that version is on a leather strap not bracelet.

In the XXXX.XX.XX PIC pattern The second number set are for the dial colour, the third set for other things inc strap/bracelet.
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