I assume HABIB's talking about the R in REIS on the reverse? I don't think it's a genuine "R/B"; I think it's just an extra-wide, extra-thick serif at the base that appears to connect across to the tail of the R. Check out the other R's on the obverse (notably the R in REX) and you'll see they almost touch.
I think you'll find they're all like that, but I'm not sure.

Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis