Oh yeah, good ole M-39.
Bred by the Super Sativa Seed Club and supposed to be very potent. It was a cross of Basic#5 and Skunk#1.
A very well known breeder stated that Basic#5 is NL#5, SSSC wasn't allowed to call it NL#5... Whatever, if that is true it is Shiva Skunk by Sensi seeds (NL#5 x SK#1).
A lot of the M-39 going around isn't really M-39 shhhhhhh.
Pick a name any name when dealing with dealers. I shouldn't say that, there ARE dealers that know what they speak of.
I've just not met one.