It seems like people searching for an 806 pair are coming out of the woodwork in droves lately. I can't blame them, though. I was in their shoes for a while, until I found Maytag's later version, a 712 model with brown control panel and brown buttons. The 710 is the model between 806 and 712, and the 10 series also has a brown panel but with white buttons. Mechanically the 10 and 12 series were the same as the 06 until Maytag switched to the short-stroke orbital transmission during the 12 series production run. The last 12 series with Maytag's desirable long-stroke agitation was produced in 1987. If you just want the build quality and reliability of your mom's machine and aren't concerned about styling or a lighted control panel, then a 10 or 12 series may be easier to find. One thing you have going for you is that the harvest gold color seems to have been the most popular.
Really, the only thing that I wanted an 806/710/712 machine for was the slow wash/fast spin option (beware though, that the earliest 806 models didn't offer this combination). If that doesn't matter to you, there are other Maytag models that offer the large tub and two speeds, just not the slow wash/fast spin option, and only the 806 offered a lighted control panel. There are old threads here that contain shots of information sheets on these series of Maytags and which models offer which features. It may take some searching to find them, but they may help you find a machine that will do what you want it to, even if it's not the exact same one as your mom had. I do get the nostalgia factor, and if I had the room I'd probably have a rare 1974 Kenmore model like my mom had, but one of those would be more difficult to find than than a Maytag of the same vintage by many orders of magnitude.