Help with a Mark II serial number

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Hello
I have found a mark II racing wit a serial number
R 38XXX
Some one can tell me what is it ?
The 861 caliber seem ok, is the later version, after 1971, with a derlin brake.
The serial number I do not understand
Probably a stupid question
Thank you for your help in any case
Pvp
Edited:
 
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It’s means it’s had a replacement movement. It will affect the value as it’s no longer fully original.
 
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8
It’s means it’s had a replacement movement. It will affect the value as it’s no longer fully original.
Thank you very much. so replacement movement have in general this R xxxxx numbers ?
 
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Thank you very much. so replacement movement have in general this R xxxxx numbers ?

Yes, I've verified this with Omega.