Hey y’all this is my first post. I’ve been trying to hunt down a late 60s mod 60 as I have a current C&R and would finally get to use it. Unfortunately I have spent the last 6 months trying to find a listing for serial number ranged but haven’t had much luck. I know that they were lumped together with mod 36 until 69 when they started with the r prefixes. Then I am kinda certain that rxxxxx was until about 73 when they started into the six figure range. My current question is what the difference between a big trademark stamp and a little trade mark stamp as I’m looking at two that seem to put them in the late 60s range but have different size stamps.