Thompson 20 rnd mag pouch, Fake or Genuine

[browningautorifle]

it is possible that the pouch could have been washed/cleaned,

I don't think so, they're tougher than that. I too think it's original but not marked. I had one a while back myself, the LL theory would hold the most water to me. I remember when those showed up as converted autos here in Canada, both in .45 and 7.62x25...using their curved mags.