That's a really interesting coin! It looks to me as if there's a bottom serif sticking out the bottom loop of the B-shape. If you look at the E in George, that also exhibits B-like qualities, but looks more E-like?The whole die and/or punches look very tired. So, is it an E with a damaged/curved bottom bar, or a B punch refashioned (for God knows what reason) to make an emergency E? Or B/E? Food for thought! The serifs of the E in Georgius do indeed display unusual wee spreads and bends but the corresponding letter in Rex has strong 'B' loops. Exactly the same as the St. James coin.They do look similar, I'm looking forward to getting the laptop out and taking a closer look. The iPhone isn't a kind tool for those sort of things!