Hi Tim, I think 1 and 3 are Nagoyamono and not very different from the worst Shiremono. To help you understand all of that. Shiremono basically means 'Mass produced' and at or around the start of the Meiji period, when Japan opened it's doors to the rest of the world, tradesmen in area's like Yokohama mass produced tsuba and other items to sell to the tourists as they came and went. Some were good, some were not. Nagoyamono generally relates to mass reproduced fittings that mimic Goto, Ko Kinko and Mino style fittings. That's what one and 3 are I believe. So they are tsuba made in Japan prior to 1900, but they are not very good ones sorry.
Number 2 is as Dave says, although I would just rate this just above Shiremono, the mei is not badly cut but the Kebori ( carving ) is quite poorly done and armature'ish.
I have no idea what you are intending to pay for these but I would suggest buying a few books instead, having a look at what is available in both style and school.
Also have a look at the following sites for an idea of genuine tsuba.
http://www.nihonto.com/itemsaletsuba.html
http://www.nihonto.us/tsuba.htm
http://www.ricecracker.com/japanese_swords_tsuba/tsuba.htm
http://www.nihontocraft.com/Tsuba_for_sale.html
Next take a look at Jim Gilbert's website, read through and look at all the images.
http://home.earthlink.net/~jggilbert/tsuba.htm
I would also like to point you to an article I posted on Tosogu.com recently.
http://tosogu.blogspot.com/2006/08/modern-collections-where-are-they_15.html#links
It might be worth a read at this stage of your collecting life. It is a hard time being new to collecting, you want to buy to learn but what to buy ?. Buying several cheap seems like fun and the way to go, but maybe buying one good tsuba would be better ?
just my 2 cents worth.
Cheers
Rich Turner