Hello David,
That dial looks good to me and is certainly OK for this reference (136.020) and the Omega Vintage Database is saying a cal. 611 is correct for this reference. However you need to keep in mind that the OVDB is not complete...this cal. 613 has an early 26mil. serial number dating it to early 1968ish. (remember also that the serial # dating charts can be +/- a year or two) I'm surmising here, but it would make total sense that in the transition from SMDV's to straight out De Villes that some very late SMDV's might have received the cal. 613. In any case I wouldn't worry too much about this as these are not super collectable and this is a nice example of the SMDV, inside and out!
Good luck with your quest!
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