Looks to be in pretty rough shape. The rare Model 25 would be a nickel plated version, {AKA:white 25} but many {except white}were manufactured between 1914 and 1958 . . .
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Vol Two, Number One (http://"http://www.airgunhobby.com/new_page_3.htm) of Airgun Hobby (http://www.airgunhobby.com/) magazine pgs 55-66 has a good deal of information on the Daisy 25 versions and dates of manufacture for different variations.
The Daisy is supposed to have markings and Doc said there are no markings. Unless rust obscured the markings,a Daisy has a 'stamping' next to the wood on top.
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This is the 'stamp' on a 1969 nickel 102 shooter. No collector value, but alot of fun.