Normally when an error occurs, the mint would overstrike the error with the correct letter. To me from what i'm seeing in both the coin i've now purchased and the Bloomsbury coin is that the serif of the 1st leg curves upwards and the curve of the 2nd legs both extend to high. I enlarged the Bloomsbury and hightlighted it a little for my own viewing purposes but the image still wasn't great. At the minute i'm thinking it's about a 50/50 chance that it could be. Some overstrikes are very difficult to see unless you have a microscope, but when i spotted it yesterday it just didn't look right, pictures can also be very deceptive, so i guess we're just going to have to sit back and wait. I'm hoping it'll be here for the weekend though and we can have a browse together. Meanwhile, here's the Bloomsbury, crap picture, but try if you can and compare the 1st B, and the curve from the bottom of the B, also if you look at the centre of my 1866 and compare the 2 centre lines of the 1st B and the alleged B, to me they both look the same, then compare the Rs in the rest of the legend, they don't seem the same as that alleged R or B. Anyhow, i might be clutching at straws right now. P.s, if it is B/R or R/B then its BB surely