The bezel insert and crown are absolutely correct original parts for this watch. For these second gen (PTX) Super Kontikis, crowns were push-pull and can be found signed or unsigned, both correct. I own three PTX examples - one is signed, two are not, and I'm 100% confident they are all completely original watches based on their provenance.
At the very tail end of the second gen run, there are some examples with a screw-down crown but those are outliers.
OP, if you can get inside the watch, you should see PTX-3 engraved in the caseback. That is the correct designation for this countdown bezel insert.
The only issue I see with the watch is the bit of lume touch-up previously pointed out. The 9 does look a little dicey. Hard to tell in the photos if the hands have also been relumed or touched up.
Otherwise I'd say this is a very nice condition original Super Kontiki.