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Photos will help, and prevent facetious comments from over eager pedants and rule/did you read the stikies flag wavers.....
Nice but for it to have any real extra value over a std model you probably need the full set. Since it is only the caseback which differs from std it would have been fairly easy to fake one I should think, particularly back when parts were easier to obtain than now. If it is legit, possibly an extract would be beneficial and certainly add value. If it isn't, you could always put it back to std and flog the presumably valuable caseback
It is NOT mentioned in the Omega bible. It only features 3 Dynamic Mk3:
The std non chrono
The Chromo
The Targa Florio LE