What is the date stamp on the gun? It should be in very small characters, MM YY format, on the left rear of the receiver tube. It looks to me like a first-generation one (early 1980's) the bent-strip safety gives it away. This basic action was the same as the also new model 34, but with more deluxe stock and a proper scope rail (the first 34's had awful short crimped grooves). As noted above the 38 was a bit of a chameleon over time.
The gun DOES have the "T01" trigger - which is a technical misnomer. Diana uses the "T" markings to refer to ANY change in the action, NOT just triggers. On this family of designs, the first-gen guns quickly got some minor tweaks (including, ironically, the scope rail!) that required the T01 mark - but the trigger did NOT change. It's an understandable mis-direction since the early guns are rare, so the initial trigger is indeed mostly seen on guns with the T01 mark.
The trigger is basically the classic Diana "ball sear" type used on the models 25D, 27, 35, and 50 from the early 1950's to the early 1980's, but modified to fit in a self-contained module. It has an excellent pull and is much easier to service than the original ball sear.
Just to confuse matters even further...the later T05 and T06 stamps DO refer to trigger re-designs (and I have no idea what T's 02, 03, and 04 were)!
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