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I had a conversation with the Grubb marquee enthusiast of the VCC and, albeit not 100% sure, he think it may not be a Grubb.
If it was, it would be one of those build in a "dark period" of the Grubb bicycles, where nothing is yet known. The period of 1952 and 1953 as soon as the brand went under Holdsworth. Which would be a rare find. Still, it would be a frame with some peculiarities.
One is the straight brake bridge. All the ones that came from under Holdsworth have a curved bridge.
The other is represented by the seat stays eyes. Here are double fluted, which is not like anything he's seen on a Grubb.I do agree with him as in my little research I also noticed those discrepancies.
Would be nice to know something about that fork crown and the tubing of this frame (plain or double butted 531)
Nervex fishtail style ligs came after the horn style so it might be from the 60s.