BIG MAC Big Mac Overalls White Duck 40s 50s 60s

This is a BIG MAC overall made of white duck that I bought at a vintage clothing store in the 1980s. I bought it intending to use it as workwear, but it was in almost new condition, so I didn't want to dirty the beautiful white, and it has been about 40 years since I wore it.

I think it's old, but there's no tag anywhere, so I don't know the year or size.
Features:
- BIG MAC buttons
- Hard white duck fabric, double knee, no apron
- Button fly (photo 7/8) ※ 2 metal donut buttons
- Buckle is PARVA (photo 4)
- Snap button is SCOVILL (photo 12)
※ Center button of the front pocket (photo 3)

Damage:
- There are some faint stains. ※ I considered using Oxyclean this time, but I deliberately didn't do anything. I think it can be washed off.
- The seam at the hem is frayed in some places, although it's not visible from the front (photo 10). (photo 13)
※ By the way, photos 11-12 are taken from the back.
There are no other scratches or tears.

Color: Off-white
Material: 100% cotton
Year of manufacture: Estimated to be 40s-60s based on the use of PARVA hardware
Country of manufacture: America if it's from the 40s-60s
Size: Actual measurements (flat) are as follows:
172cm tall, the length is just right, the width is loose and roomy.
Waist 46cm x 2
Total length 110cm ※ Length from side line to waist
Inseam 74cm
Rise 63cm ※ Length from top of bib
Thigh width 31cm
Hem width 26cm

It will be shipped folded compactly.
Please understand that there may be some wrinkles.
If you have any questions or would like additional photos, please feel free to ask in the comments.

I'm selling a lot of denim items, mainly Levi's, so please take a look if you're interested. (There are some old items, but most of them are from the 1980s and later.)