Hi there:
Can you give us another closer shot of the signature, or with it cropped closer. Then also try another pic with rubbing some *ash* (dark) on it -- or another with some *talc* (light color) on it. Either the dark ashes, or the talc might help us figure it out.....plus a closer shot.
Looks like something like Poulin, or Porulin....we will give it another try....
never say Never...LOL