PJ150, your first gun appears to be a Combat Masterpiece, if it had a K prefix then it would have been manufactured in 1952. The serial number range 1299xx was assigned during the period 1906-1909. I can't give you more data than that, it might be worth while asking in the firearms research subforum, or start a new thread in the revolver forum to see if anyone can ID it. it may be an early gun that has been rebarreled or a Pre model 15 with a serial number that doesn't match the SCSW3 list.
Your model 36 is a flat latch, so it was made before 1966, and after 1962, when the serial numbers started at 295000. Value is somewhere around $250-$300.