Yeah !! I looked at it before but got sidetracked !! Couldn`t read the mark but that is not unusual on one like this !! I am pretty sure this was done by an independent potter !! Look at the outside and you can see the striations where it was likely done on a wheel,, painting is simple and has a few runs so I would bet this was done by a hobbyist and pretty new one at that !! Try doing a pencil rubbing on that mark and maybe you can see it !! Maybe wrong but I don`t think so !!