It's rather odd that the Peugeot came with the Simplex Juy 543 rear mech so called because it could be setup to run 5, 4 or 3 speed but didn't spec a 5 speed freewheel untill 1959. The madness of it all, they were still trying to figure out what to call their top model..PH10, PHX10, PLX10, LX10, PHX10 again or PX10..phew..Interesting. So catalogue spec top end in 1957 was still putting 4 speed blocks on. I've had a little meltdown over this.