Hey all, I don't have much knowledge about swords, but I'm going to give my best educated guesses.
It was tough researching the fine details, but the bits and pieces of history i've looked at are hopefully accurate. 1) Looks to me like an Early Muromachi period blade. From the Kanemoto school by the smith Mei-o. just judging from the size of the shinogi-ji, ji, and hamon being equal sizes. the Ha seems like a wavy pattern found from this school and era.
2) This looks like a Nambo kucho period blade. sometime in the late 1300's at the soshu school by the smith Koan.
The Shinogi-ji, ji, and hamon are about equal widths, and the subtle fine Ha markings make me think its using this style.
3) This one looks like a Kamakura period blade. maybe from Masamune using the soshu school technique. Early 1300s
It really reminds me of a masamune blade with the Shinoji-ji much thinner than the ji. The fine Mune behind the Shinoji-ji, and the Hamon with its wider waves.
Brian's idea sounds good