Careful with "original". This watch was delivered on a leather strap, assuming we can believe the Omega Vintage Database (sometimes we can't). That this watch was mated with this bracelet when it was sold is certainly possible, but unless you have the sales receipt, there's no way to prove it one way or another.
The condition is quite good, at least what we can see so far. Rarity, can't say, but if you're not finding a lot of them in a search, then "rare" might apply. Value is always a personal thing; certain watches bring higher prices because of perceived desirability, and it is definitely true that condition matters. I note that the chances the crown is appropriate for this reference is low. However, the appropriate crown is plentiful on the secondary market and still, I believe, available from Omega.
I would not be surprised to see this watch listed above $1000 in most places, just based on this one picture. More I cannot say.
