I think MAX, a regular commenter referred to the 1930 wave  rally. I took a look at it and it looks like a...triple zigzag.
Lots of similarities but enough subtle difference to make it of course unique which waves almost always are in some form or another.
The rally lasted about 5 months. Each zigzag took 6 weeks or so except the first. Same here. None of that may mean squat, but it is interesting.