You have given no description of the condition of the gun so I can't give you an estimate of value. So I'm going to post a link at the bottom of this page for you to ask "Daisy Antique" the same question and have them assist you. ( See the link below)
their were several Daisy models made in 1985. You need to state the Model Number to determine the value.
Depending on condition, 60-175 USD.
From 1927 to 1932 Daisy made the model 27 in both 500 shot and 1000 shot. #500 shot in good condition is worth between $100-$130. #1000 shot in good condition is worth between $135 - $175 both of these were .175 caliber Not .177 Caliber.
This model was manufactured between 1979 to 1989 it is a 24 shot bb pistol. In excellent condition it is worth around $45.
Without more information about the condition of the rifle it is not possible to answer your question. Your best bet is to ask Daisy. Daisy offers a free service to tell you more about your antique air rifle. see the link below
It all depends on the condition and model of the rifle. Daisy has made several versions of the Single Shot. The model "A" Single Shot, model "C No1", model "C No2" and the "Sentinel Single Shot". Most were made in the early 1900's. Can you Identify your model?
50-100
It was made for Daisy by Milbro in Scotland. It's a Diana brand (owned by Milbro) between 1965-74. In excellent condition it is worth around $60 - $75. It shot Pellets or darts.
The Daisy model 96 is a 700 shot BB rifle that was made between 1963 -1973
Unfortunately there is not much of a collectors market for this item. It's basically what the buyer is willing to pay.
100 or so
I would check with Daisy and see if the New model 25 shot tube will fit your rifleSee the link below