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SideshowBob
Thanks @clubman and @Jonny69 all great stuff, although I can't say it fills me with enthusiasm for fitting cotters! I have a BSA set to fit to a 1948 Hobbs so it's in my future nonetheless and I'm sure that'll all be helpful.
I've recently got hold of a Reynolds 2 bolt stem, it looks like a really early one to me, wanting to share details and pick anyone's brain that cares to pitch in. I've not seen markings like this before, only the version with "Reynolds" in the recessed bit of the projection. I guess the patent number 1121-36 means a 1936 patent date, which makes sense with the advert I found on Graces Guides from July of that year. [I hadn't realised that R.R. 56 was the Hiduminium alloy rather than a Reynolds model name - details here https://en.wikipedia.org/wiki/Hiduminium.] I have no clue what the markings on the non-drive-side of the clamp mean.
Got a worrying feeling this means I need a 1930s bike to go with it.