It's hard to say how the seller came up with the 25" wheel number. 700c rims are just a little over 25" in diameter, so maybe that's what it is. All wheel sizes are pretty much jibberish because they consider rim and tire in the size. See this chart for reference. (oooh, forgot that road 24" was different from MTB 24") Just the wide variety of 26" rim sizes gives you an idea of how little most wheel size quotes mean. And there are at least four different 24" rim sizes.

If it's a 25" frame, it's pretty huge! You better have been on your high school basketball team to fit that frame.

The Terry bikes and others like it had the small wheel to make small frame sizes possible. 48-49cm is about the smallest frame you can really pull off with a 700c front wheel. That Bianchi is a 44cm. Seems like junior road frames with 24" wheels front and back used to be somewhat common, not so much any more.