Hi John,
Glad you found the website before I could recommend it to you.
Like
dl351 mentioned correctly, the order or production was the "square SOG logo" with 'S. M. CA" under it, then with 'EDM. WA' under it, finally followed by the logo itself with nothing underneath it.
We can only give an approximation on production period based on when SOG added or removed the knife from the catalogs. As to when a particular 'S.M.CA' or 'EDM.WA' or 'no markings' knife was produced, some digging is required to find out when SOG shifted its factory around those places.
Regarding the sheaths, those made in 'EDM. WA' will have that words under the sog wordings on the sheath itself, as seen from the ebay pics. I have an old Tech (no markings except plain old sog logo) on it - which meant it was a late production, somewhere near the year it was discontinued. It comes with a leather sheath if that helps... On the contrary SOG may have changed to leather based on opinions that the nylon sheath was no means a fair piece of clothes for the beautiful Tech II, which was never meant to be a "tactical knife" with a nylon sheath.
And.... I too bought a Tech and a Tech II in the past 3 months! Some great sales lately!
Beautiful brass guard with the knives, I can't keep myself from holding them and looking at them!
Hope this helps!
Cheers,
Mark
SOG Knives Collectors