Maybe those "cable guides" are intended to mount a rack, maybe a rack built for this bike? Remember that there is a cable guide on the BB for the rear, and you don't really need a guide for the front.

I agree with the speculation that this is the product of a US small builder or hobby builder. Prugnat 62-D lugs were available from Proteus.

The handfull of frames I have made over the years will be fodder for future "ID this frame" threads.