Mk20 or Mk25?

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Vq-1

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Location
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Question, how can you differentiate between an early Mk25 vs later or even upgrade Mk20?
Would it be the swivel turret, the round holes vs oval holes? DIN vs yoke availability? Serial number?
The serial number I have is #020201190
Thanks
 

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“Pop the trim boot off the end near the yoke. If the seat retainer is round with a recess for a large allen wrench it is a Mk 20. If the seat retainer is hex shaped with a small hole in the middle for a small allen wrench, it is a Mk 25 - or it is a very late production Mk 20 that has been converted to a Mk 25. Either one may have shims as the IP was intended more for precision adjustment and shims are still used inside and out.”
 
https://www.shearwater.com/products/swift/

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