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Thanks for your interest and comments, I cannot be sure of what work the frame has had over the years, the story of the 90's refurbishment at Roberts fits the condition and components attached. If it is as old as a 150 number suggests it must have had updates to the frame as the changer mounts are brazed on. That said any number could be struck on there later, but there are no other numbers visible on the frame. I have not taken the steerer out so maybe I should particularly as it has a manky Shimano 105 headset at present. At least it has a good home now and will be around for future generations to appreciate the engineering.
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That looks very nice indeed and well saved from the skip!
I've not seen Roberts of that age (in the 100's) marked there on the bottom bracket. Rather the marking is on a rear dropout (and fork steerer). Not saying you are wrong, of course!
I have frame #506 with the same 'R' drilled out of the bottom bracket, it also has drilled dropouts and the R on fork and seatstays, with a chrome fork and chainstay, like yours.
As a prior owner of #107 and #137, these were also numbered on the rear non-drive dropout.
I have a late-70's brochure, which I'll try to upload.
Cheers!