First of all, welcome Rick, and compliments for your purchase:
probably the most rare execution of the Siffert Autavia,
in good conditions, and also with same era bracelet!

You were following the forum, we expected a much higher price for this watch.

About the restoring, the general advice is always 'conservative restoring':
the less parts you replace more valuable is the result.
Unfortunately this is not philosophy of the service center of producers,
their aim is to give you a fully functional watch regardless of its original status.

I recently learned that Omega replaces entire movements on serviced watches,
they have ready many movements (with other serial number) and fit into the watch.
So it has happened that someone aske for extract of archives of his Speedmaster and received
the papers saying his watch was originally a Seamaster!
About dials, i know that, due to radioactive export regulation in Switzerland, Omega changes all the dials
with luminova or relume them if not available.
So if you want to destroy your vintage, send it to Omega...

I hope that Tag Heuer is better, but i sent them a couple of watches and once received their mail
saying what they were going to do and what i was going to pay, I asked for having them back immediately
without any work...

About the work on your watch, this is what i would do:

Movement servicing: I hope you took a photo of the movement, it guess it's a very early execution, with fast date change, early jumpers, bimetallic pinion, spaced writing on the bridge etc. None of these parts have to be replaced.

Gentle dial cleaning with no relume.

Hands polishing with no relume.

Replacement of crystal, bezel insert, pushers and crown. All these replaced parts have to be returned.

I hope that TAG will do a nice job!

Attached i my Siffert coming from mr. Abel: