Vacumatic identification-help me please
 

I have a Parker vac. pen, that needs some retoration(mostly stained
nib and not working filling mechanism), but I don't know if it is
worth sending to be profeionally restored. It has 13,5 cm length,
double jewel, no inscription arrow clip (gold plated), triple cap ring
of equal width, two-tone nib, but unlike nost vacumatic I've seen it
isn't striped: it has brown-marble finish. Is it looked for? what
model might it be?