I strongly advice you to read Forums on how to germinate old Seeds. There are 2 o 3 Forums on how to do it with 30 Year old Seeds. Dont mess this up since old Vietnamese are the real deal, and you might have some of the last Remains. There are only 2 remaining Vietnamese Seedlines, wich are from 70s, a third died out couple years ago, but was alive not long ago.. All 3 Lines have Smokereports of highest order. They are very psychodelic. Newer Vietnamese i seem to hear arent the same in most of cases.
If you manage to germinate them, shure pollinate every Plant with every Plant, Attention when open pollinating with multiple males there might be predominance of early male, so maybe pollinate every female with every male by hand in different spots SEPARATE...
If you only get one single plant, i or some of my contacts may give you one of the 3 remaining vietnamese-Lines, to atleast preserve 50 Percent of these Genes. So, plan this worst case, trough contacting me, or i contact you for giving my contacts to you. Got it. ?
I think if you get something, wich is possible even after 40 years, there is quiet good chance it is Gold!
Aswell, let them sit in a cool, but never too near of Freezing temperatures(they could die then), dont let to much moisture to them. Place Rice corn or silica-gel packet into the airthight container, to suck up moisture...
Links to the Forums for germination old seeds:
more to find..
There are more suche Threads on icmag. Sometimes you will have to use google to find things better, cause sometimes search-algorythm isnt perfect on icmag.. Google this frase, or similar:
germinating old seeds site:www.icmag.com
personal mail me on icmag if questions