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It has an expander bolt and as far as I can tell that is original. Diameter is between 22mm and 22.2mm depending on where I measure it :D Clamp a little over 25.4 but untightened.
I do wonder about older alloy components failing, specifically handlebars. I searched the internet a lot on the topic a few years ago and found plenty of people saying they wouldn't risk it, but very few reports of it actually happening. One considered write-up I read said they would be very unlikely to fail catastrophically, more like warp and bend.
No problem being told stuff I know. There's plenty of stuff I don't know, so better to risk it!
Pretty much everything about that advert is great. I'm not sure if many would pack 'shaving tackle' or a fountain pen for a cycling holiday these days. Also interesting to read cyclists were covering their steel components with vaseline in the winter!
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veloham
The.Gren
I think your Wikipedia link is broken. This one should (lol, will it?) go to the Hiduminium alloys: https://en.m.wikipedia.org/wiki/Hiduminium
I just got completely sucked into reading all of that and then got onto Duralumin and Y Alloy. Had to stop! Interesting stuff, so it’s a casting alloy and needs heat treatment, followed by age-hardening at room temperature for a week. Strikes me that it’s not very stable and I’d wonder about its physical properties being the same after 80 years! I’d wager that many failures might have happened as a result of this or incorrect heat treating. It’s not exactly the strongest stuff to start with either. State of the art at the time though!
Your stem there, check the stem diameter because it’s an early one. Earlier stems for head clip headsets are 22mm compared to the usual 22.2mm and you won’t be able to use it in a fork with a conventional headset. Apologies if you already knew that!