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Im in the same position looking for a Speedy, and if i have my marbles correct, the Hesalite one does not come with see thru backside. the hesalite got solid backside that one probably is shapire both fron and back
Maybe I have misunderstood something you have said and I am posting this in error, but I’m not sure the 863 movement is the only evidence to identify a 3592 over a 3572.
Here is a 3572 with the 863 movement and an extract. Production date of August 1996.
https://omegaforums.net/threads/199...572-50-tritium-dial-sapphire-caseback.161764/
For the OP- you mention the listing comes with the original warranty card. It is possible the seller typed the incorrect reference in error. If the listing doesn’t show the card in its entirety, revealing the reference, you can always ask for a photo of that, which would resolve this.
Warranty card is blank unfortunately but I did do some research and this seems like a transitional model that is a 3572 with an 863 movement. There were many threads on this forum covering how some 3572s came with this movement. Apparently its fairly uncommon and it actually makes me like the watch a little more so I think I'm going to go ahead and purchase!