If you are not able to reliably identify genuine watches, you could stick with Prateek (hmtwatchesonline) or Fateh (fatehbajwa).
The latter has two stores on Ebay that are linked in his profile. He currently does not offer any Janatas, but he is usually able to source watches on request. I bought a Janata and a Pilot from him some weeks ago and can fully recommend him. It seems that authentic HMTs get a lot rarer on Ebay, possibly due to the closing of HMT watches. (Which really is a shame.)
The latter has two stores on Ebay that are linked in his profile. He currently does not offer any Janatas, but he is usually able to source watches on request. I bought a Janata and a Pilot from him some weeks ago and can fully recommend him. It seems that authentic HMTs get a lot rarer on Ebay, possibly due to the closing of HMT watches. (Which really is a shame.)