You have a late model bottom of the line Maytag. I hope somebody else will chime in, but it's probably from the end of production, about 1980 to 1984. It's attractive because it's relatively new and in very good condition from the photos, it also has a pump, which was optional.

I see two pieces missing. One is a rubber bulb safety foot pedal that plugs into the leg with the wringer head.  This was a safety device: as long as you stepped on the bulb, the wringer rollers would turn.  They were fragile, and often disconnected and the safety feature over-ridden. If your wringers are still operational (move the paddle on the side of the wringer head toward or away from you), don't worry about it being missing. Everybody gets rid of it, it's a nuisance to work with.

The other item missing is an aluminum pipe bent into a "U" that screws onto the end of the discharge hose to hang it from a stand pipe.  Have a look through the garage.

Pricing is subjective, it's a common model, but it's a newer machine and in good shape with a pump. On the other hand, there's almost no market for these units. It will either be purchased by somebody that will continue to use it as a washer (that's a rare bird), someone that wants to use it as yard art, or somebody that wants to turn it into a cooler.

I'd price it at $125 - $150 if you actually want to sell it. Ebay/the picker shows/antique malls give the impress that they are worth more, and very high prices are often asked, but unless you actually bump into a sucker that doesn't know better, the units never sell at that price.  In fact, many of these units are really worth no more than scrap since they've been outside for years and water's accumulated in them, ruining them .