Vince is correct on the Midnight Tiger...along with the date. It maybe was a tad earlier, but not by much (1988-1990??) with maybe a couple year production run. It might have gone as many as 4-5 years.
It gets a little
fuzzy for me remembering some of these dates because SOG might have had surplus knives in stock but had stopped making them (even stopped advertising them) and I remember seeing them in inventory for years after manufacturing had ceased. Also, when working at SOG, I'd research info like this and post "hard" facts. I just don't have access to that info these days. I also had sources that are just not available anymore. You'd be surprised at key SOG personnel who just don't know some of this. In answering this type of stuff for you guys back when I was Ron@SOG, I'd have to do some serious reseach to get the answers you guys expect. So, I think I remember seeing some Midnight Tigers remaining in stock shortly after joining SOG's management back in 1997. This scenario would make some of these knives technically remaining in inventory for years because customers just didn't know a few of them were still available (thus they "couldn't" buy what they didn't know about). Also at that time, SOG wasn't running an in-house retail department (we were selling accessories, but not knives), so clearing out some of these knives was quite difficult. Shortly after being hired, I started SOG's retail department while I was overhauling departments I managed (due to my skills and background, you can say I was hired as a "reformer" of sorts). A little later, in an expansion of SOG's retail department, I started and developed the factory seconds program around 2002. In that era, this was the best evolution that could have happened to SOG's retail program! There were many knives that remained in stock for years after production ended. The Yellowhorse Paratool is a prime example of a "knife" most customers had no idea was still available (I wouldn't be surprised if some are still there!...but in this case, no one really wanted this knife). All this brings up a good point. If you want a discontinued knife, it would certainly be worth checking with SOG's retail personnel to see if any remain for sale. Also, just don't take their word for it. Some of these staff members are good-hearted and wonderful customer service staff members, but from my experience, it is hard for one person to have "all" the answers and most of them are new enough that they haven't had the time to invest in learning all the history (they're still working on product names and prices...even some specifications). So ask them to ask a manager, go back to see for themselves, and/or ask the shipping supervisor to look ("eyes-on" is the ONLY WAY!). The warehouse is a large enough area with LOTS of stock. Often, some of these discontinued product can be stuffed back in a dark corner.
Sorry, I digressed...That can happen sometimes with me...Is it old age? My father-in-law (67 years old) will talk about old cars for HOURS! 
...I have zillions of stories like this...
SOG also ran a few other blued knives around that time. Knives that readily come to mind are the Nite Tech, Recon Government (a little later, I think), along with the Midnight Tiger. The Recon Government had a long production run through much of the 1990's. These blued knives ran
concurrently with their standard counterparts.
Regarding SOG's use of carbon steel, I'm sure you guys know that the only carbon steel SOG has ever used is SK-5.
Bubbaganew has it
very correct with this statement (based on my quote from the
earlier post back in 2002):
According to the paragraph above both the carbon steel Tigershark and the stainless steel Tigershark were made with the grey powder coating in non serrated models. Therefore according to the paragraph above Gshock300's Tigershark could be carbon steel but it could also be AUS6. If you were a betting man you should put your money on it being AUS6 because there were more of them made than the carbon steel model.
I don't have the stats, but my "gut" says anywhere from 50% each (carbon versus AUS6) to 75% AUS6. It would basically come down to the number of years this generation of the Tigershark was produced (powder coated, non-serrated). Production numbers stayed relatively consistent. Example: if it ran for three years, 66.6% would be AUS6. I'd bet on it being either 3 or 4 years. After this period of time, the serrations came.
Someone's got to email me when my help is needed. I miss quite a lot in this forum.
