Interesting subject drift there, Anthony!
The trouble is likely inside the switch mechanism. Have you swapped out the wires to see if the other two speeds work when their leads are connected to the "high" spade?
If you can pull the entire switch box out, you may be able to determine whether it can be taken apart. If not, then I'm betting that the other blenders you posted pictures of above will have the same arrangement that could be swapped out entirely. It would be nice to keep the buttons all white though, and depending on the type of donor blender you choose, it may require opening things up on both the new and the old in order to harvest the white buttons from the bad switch.
Keep us posted. I think it's worth it to obtain a donor blender in order to keep your rare model in proper working order.
[this post was last edited: 9/5/2019-14:35]