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@Wheelnut
I had read also that Holdsworth-built Freddie Grubbs were built of plain gauge 531, but not everything published on the internet is correct.
This frame weighs exactly the same as a similar size Hetchins that I own, and I know that my Hetchins is 531 butted tubing throughout as I have the build card. If the Grubb had been built using plain gauge, it would weigh significantly more than the Hetchins. Draw your own conclusion...
The customer in the early 1950s era could almost always specify what he or she wanted in terms of tubing type, paint schemes, chroming, braze-ons, and sometimes even the frame angles and bottom bracket height, and this was true even with the relatively large-scale lightweight specialists such as Holdsworth. Perhaps it was a special order? Or perhaps the Perfection model was built of d/b 531 as standard.