I'd love to see that old beauty rescued and brought back to life. I've been on vintage rides in past years where a couple of guys always brought at least one Herter's.
I agree with uncletom that these are cool old sleds. Also agree that a lot of the parts are "off the shelf" things that were bought by the manufacturer (motors, clutches, bearings, and so on). It's surprising how much standard stuff these manufacturers used to get a sled on the market in the boom years of the 70's. For some parts, the trick is to find out what will work from another sled brand because there may not be a lot of parts sleds out there for some brands. Parts from another manufacturer may work (track, drivers, springs) but it can be a challenge to figure out what is interchangeable.
Someone can probably correct me on this but it's my understanding that these sleds were built specifically for marketing by the Herter's company via their catalog, as opposed to Sears Roebuck and Montgomery Wards that sub-contracted their sleds from manufacturers of other brands - Polaris, Gilson, etc. If true, this makes these sleds pretty special.
Like old abe said: "The stories this sled could tell". Think that's one of the reasons that the vintage world is so interesting. These old relics have a history that is unique to their place in snowmobiling history.