Omega 4702 ??

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I bought a vintage Omega with reference number in the caseback 4702 (produced by Denisteel in England for Omega it says). It contains a caliber420. I cannot find any information about this reference number. Could it be that Omega is using a different number for this case?
 
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Dennison cased watches do not have Swiss analogues.
Edited:
 
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Dennison cased watches do not have Swiss analogues.
Do you know where to find any information?