They had the T01 from its inception in 1984 or 1985 until the T05 replaced it perhaps in 1991. I believe the T05 actually came out in 1990 but did not make it into the 34 family until 1991.
I forgot to mention the first generation of these guns in the US also included a model 38, which had an even nicer stock done in walnut instead of beech. These guns did have the so-called T01 trigger (basically the classic Diana ball-sear in a packaged module, with a safety added). But don't forget Diana uses the T numbers to indicate ANY significant change in design, not just triggers - many of their older guns have such markings which causes some confusion. The T stands for the German word "Typ," meaning type or model. To me "T01 trigger" is a bit of a misnomer since the guns do not have "T01" stamped on them.
Many Thanks for the information Gents!! I knew this was the place to ask! Actually - it was manufactured in July 1985 (very small 07 85 at the rear left side of barrel).2nd question? Does anyone manufacture plate to cover up the holes (where I think the sites were to be located?) My FWB-124 has a fancy dancey plate that covers this section. No big deal - I figured with the 3D printing available someone may have something. Please see pic..Thanks again!!!Ranger94
Hi Mike,Some of model 38's had walnut stocks, but most of them had beechstocks.