A while back I put together a video on the development of the Colt/Browning 1911 pistol, and one of the missing links in that video was the Model 1909. Well, one of the 23 Model 1909 pistols is up for sale in this next Rock Island auction, so I took the opportunity to look at it more closely. The 1909 is the point where many of the distinctive elements of the 1911 first appear, including the grip safety, push-button magazine release, and the swinging link, tilting barrel operating mechanism. However, it still retains several of the elements of the early Colt/Browning pistols, like the nearly vertical grip and the lack of a thumb safety. Given that only 23 were made (and by the time the Army was actually testing them, Browning was already busy on the improved 1910 version), they are not the sort of gun you come across every day...
You can see the longer 1911 development video here: https://www.full30.com/video/25ca196aff83b39369aa0cee0698f2e9