PORTER Early Model 60s Doctor Bag Rare

An early bag from PORTER (Yoshida & Co.).
Approximate measurements (please allow for slight errors):
Height: 28 cm
Width: 37.5 cm
Depth: 17.5 cm

This is a very old item, believed to be from the 1960s based on the tag.
This product predates Yoshida & Co. becoming widely known, even before their nylon series (Yoshida & Co. was founded in 1935, PORTER started in 1962).
As you can see, it has a rare shape and pattern. I own many vintage PORTER items, but I have never seen one exactly like this.
Please note that the key is missing.

As this is an old item, there are wrinkles and internal stains. If you would like to see specific areas, I can add more images. Please understand that this is a vintage product before purchasing.