Reddit mentions of Field Notes - 56-Week Planner - 4.75" x 7.5"

It doesn't fit all your specifications, but...

• Muji weekly
  
• Muji monthly
  
• Field Notes planner

Amazon sells a Field Notes 56 Week Planner
https://www.amazon.com/dp/B017OAACSI/?coliid=ICFGW2H0JSU2U&colid=1C2P1FGVXL68R&psc=0&ref_=lv_ov_lig_dp_it
It's a bit misleading because the product name makes it seem like it's for 2016 only but reading the reviews, it looks like the dates can be filled in.

I also found the Field Notes Resolution 3-pack on Pencils.com
https://pencils.com/product/field-notes-resolution-3-pack/
One of the notebooks contains a blank, 56-page "date book" which looks like basically a weekly planner with the dates left blank.
I've only ever bought one pack of Field Notes notebooks. I like how nice and portable they are, so I imagine that the calendars will be perfect for carrying with you. Good luck!

I've been using this Field Notes 56-week Planner this year.

It's simple and undated, which fits my needs quite well. I'm just writing down distance, pace, some details for workouts, weather and how my body feels. The only con is that I wish it had more room to write for Sat/Sun, but since I treat Fridays as rest days anyway, I just use that space to describe my weekend long runs.

I'm still working out a system of my own, but it right now involves

1. This planner
   
   
2. These as an on the go planner filler
   
   
3. Notecards that I write lists of things I have to do on