Probably the town where it was originally sold only had channel 25. UHF channels were scarce in the early days, and it's possible to construct a tuner that receives both VHF and UHF if the right strips are inserted. This article has a description of a 1953 VHF-UHF tuner. It also includes a journal article that describes the tuner in more detail.
http://antiqueradio.org/RCACT-100TelevisionDesign.htm
Phil Nelson