Agreed, and also, when the seller fails to provide any further pictures, that's often a warning sign to be very wary.
Regarding price range:
1500USD is a price that should include enough pictures for you to be certain. Compare:
https://omegaforums.net/threads/omega-constellation-168-005-dog-leg-pie-pan-euro-1350.134693/ - this ones last offer was pretty much spot on 1500USD shipped.
With only this one picture, my rough calculation would be:
Value of the case: ~500USD (the last two I saw on ebay went for 550USD and close to 600USD)
Value of the bracelet: ~200USD
Value of the hands: ~50USD
Value of the dial: ~200USD
Value of the plexi & crown: ~50USD
I'm applying pretty low prices here that can be realized even if it's a redial, even if the crown is a modern repro, etc. etc. - assuming the worst case, so to say. This'll add up to about 1000USD, so that'd be the max I'd be willing to risk if I was after it and felt like gambling. If it arrives with the correct cal. 561 in it: perfect, you got yourself a deal. If it doesn't you'd be able to get back your money, albeit with a quite bit of work.
That being said: It's not a particularly uncommon ref, especially the date ones. If you don't want the work, a nice example for reasonable money will come up at some point in the not too distant future.