Hi Rich
sure, a trans. dial alone isn't a transitional monaco, this one has the same dial configuration like the offered one.

The printing seems for me to be the same as on the blue transitional dials.
on the cataloge from 1970 they are figured side by side

this one is a 158xxx

and may be delivered with standard hands. Prospect, serial no., dial are aspects that fits.
I think both are transtionals

even with the movement, pittings on the base plate indicates me something early .

cheers mich