I do not believe that Diana ever made a model that was in production for 100 years. (1890 - 1990)
The Diana Jahre is the model 34. The original model 34 was made between 1928 to 1940. Then in 1984 Diana made a new model 34, the Jahre, This model is known as the model 34/34BC/34C/34N. I Believe all these models are discontinued now.
I am not able to answer you about the value with knowing the condition of the rifle. It could be junk or one in excellent condition. Without more information it is not possible to answer you. YOU need to give it some sort of rating like POOR, FAIR, GOOD, VERY GOOD or EXCELLENT condition. Then I can give an estimate of value.
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