Mine was made in 1980 or 1981, can't remember. The date code should be on the left side near the rear of the receiver. Some older Dianas do not have the date code, not sure when this started. From what I have seen this gun was made for a long time and in a few different versions. Some of the earlier ones were Belgian Dianas. The later ones, from the 70's on look like a mini Diana 27. Same style stock with the rounded pistol grip and red pimple on the heel.
Here is a crummy pic, it's the top gun:
As the other poster stated the Diana 24 would likely fit your needs well. Used ones come up for sale pretty often and usually go for around 150 dollars.If you want to stay vintage you can't go wrong with the Diana 27.
HTH,
Brian