there are a couple differences between the 7750 and seagull, one being that they have a different beat rate; 7750 is 28800, seagull is 21600, so on a watch with a traditional seconds hand that rotates around the whole face of the watch, the seconds hand will not be as smooth in its movement in a seagull as compared to a 7750. but because the seconds hand on the 569 is so tiny, the difference is barely noticeable unless you have 2 side by side to compare. secondly there are many who argue that the seagull is more reliable than the 7750, however the troubles with the 7750 were with the watches that had a chrono function, which the 569 does not, so on a performance and reliability matter either one is fine. but i think the main point to take note of here is that the price of seagull pams is quite a bit cheaper than their 7750 counterparts, and yes the exterior is all the same regardless of whether its a 7750 or seagull. i've had both a 7750 and seagull 569 and they're absolutely identical.
another difference is the position of the balance wheel: 7750 is at 11 oclock, seagull is at 6, however the gen p9000 balance wheel is at 7, so both are wrong in this regard, but the seagull one is "closer" to the gen placement of the balance wheel. but this is a pretty moot point since the 569 has a closed caseback. if not for the price difference, i would go for seagull for display backs like in the 312/351/441 simply due to the movement looking more "accurate" than the 7750.
but because of the price difference, and negligibility of the slower beat rate in pams cos of the tiny seconds hand, personally for me i would always go with the seagull option. but of course that's just my opinion. hope this helps make your decision
