Metres First 5513 - Bezel Question / General Condition

As I'm by no means an expert on vintage Rolex, wondering if the enlightened here can comment on a metres first 5513 I've been offered in trade - particularly the originality of the bezel:
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Serial number dates the watch to 1968 (1806***), it has the "puffy lume" that is typical for this serial range that looks to be in nice condition. To my eyes the dial and hands haven't been relumed, but if others think they have certainly open to alternative opinions.

Known issues:
- Crown replaced with triplock
- modern bracelet

Watch is claimed to have had one owner since new (gift from parents), who traded in on a newer Omega Seamaster given concerns over value and not wearing it.

Any comments, including whether that is the original bezel, would be appreciated.

Definitely later insert. 'Long 5' would be correct. Expect high 2k+ for a good one. Try to find on that already has a pip as those are in the $200 range.

The later bracelet might be an improvement depending on how you feel about the jangly 9315 vintage bracelets.

Not a terrible example by any means, depending on the price.

Thank you for the comments and clarity on the insert. It’s being valued at around $13.5k in a trade…