751 is a Day-Date movement, not a date only movement and its the chronometer version, so something's wrong here, may have been assembled from bits
OVDB gives the movement as a 563 or a 565. The 751 train bridge will fit these as they all share the same base movement. http://www.omegawatches.com/planet-omega/heritage/vintage-watches-database?ref=14368 I don't know if the 563 has the quick date setting, but if it doesn't, that might be a way to help identify what the actual movement is. My suspicion is that it is a 565 and that the bridge went on (possibly by mistake) during a service - in which case someone has god a 751 with a 565 bridge.
i also tried it when by rotating the hands but can only hear the date clicking when jumps but no sound of a day
As others have noted it's probably an incorrect part placed on a another movement, and not really a Cal. 751. On the day/date sounds, if it's set-up correctly, you should only hear one click as they change together - this can be adjusted on this movement actually. Here is one I adjusted and this video shows it before I had it fully adjusted, so the day and date change is close, but not within Omega's tolerance of 5 minutes: Here it is after adjusting: Cheers, Al
I watched the watch video and afterwards it showed a bunch of thumbnails for related videos. That took me to Jim Parsons wearing a housemaid outfit on Conan, which took me to Kevin Polak doing Christopher Walken impersonations on Conan, which segued to the top 10 movie scenes with Christopher Walken, including the one where he's an army captain who carried a watch up his butt in Nam for 2 years. I loved segue back to watches...