I was thinking post-automation because of the screwhead mark on the bottom. My understanding was that using screws to identify potentially problematic patterns (wow, alliteration) was something introduced post-automation, while pre-automation they used the letter pattern ID markings.
I was questioning if the lid matched. At first glance it does seem from a RM pattern, but with a closer look the dimple pattern is pretty organized, and though the bulge on one side of the handle isn't as distinct as usual for post-automation, it does bulge more than the uniform thickening from one side to the other that I'm used to with RM lids. Perhaps an early automation example?
I'm not saying I know any better, only saying that was my understanding. If I'm wrong I welcome the opportunity to learn more.