I just can't imagine the hours, days and weeks to polish all those complex AL and steel components.
The Dural Azure stem alone is a pain having done it myself - they are like this originally.
[ the unused hole at the top for the cable seems to have been made by the / a bike builder ]
On a very very pedantic level, it's a shame it's missing a grease nipple port on the BB and the KMC chain.
Here is another fine example and very good read.
https://onlinebicyclemuseum.co.uk/1940s-velo-aviac-mecadural-duralumin/
