I have been using my new (for me) 1963 SS for a couple of days. Yesterday I used a Wilkinson Sword blade that I had used already for 5 or 6 shaves (3 passes each), today I used a new Astra Blue Superior Stainless. Both times, the 1963 felt heavier than the 1963, and a bit more agressive. The Astra felt very smooth in the first pass, but even cold water at the end stung a little. After weeks of using the 1967, I got very comfortable with it, and had hardly any irritation. With the 1963 I had tiny red dots on my cheek and neck and my alum block let me know that I had a closer shave than I wanted. I guess this means go back to fundamentals and take things easy until I learn how to shave with this razor. I didn't expect the two razors to be any different. Has anyone experienced something similar with SS of different years?