Siffert Serial Number Query ??????????

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Hello there-im hoping you can help me out ?

I have been offered a Heuer Sifert 1163 that has a serial number

203974

When I’ve checked the website on the dash for the serial numbers that indicates a MARK 4

BUT

The dial and handset correspond to a MARK 6 ?

SO-did Heuer ever do this i.e. place a new watch in an old case ?
 
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Not impossible that it left the dealer that way (it would have left the factory with a tachymeter bezel, but the MH bezel was a dealer option). I do think 203xxx is a bit early for a Mark VI but I can't be conclusive about that.
 
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Apparently Mark 6 watches should have the serial numbers

224xxx; 241xxx;242xxx;243xxx;

thats why I'm stuck ?