Triangular Scale 30cm Wooden Fuji Corona for Architectural Drafting Scale Ruler

Drafting triangular scale, Fuji Corona. Believed to be wooden (probably).
Fuji Corona was a company that manufactured and sold drafting supplies and precision equipment, but it has since gone out of business, so it may be difficult to find items in good condition.
Apologies for the ... quality of the images.

Scales are 1:100, 1:200, 1:250, 1:300, 1:500, 1:600.
The groove in the middle (is there a name for it?) is colored green, yellow, and red. Perhaps this is for easier identification by color?
There is not much sign of use, but there are some scuffs and dirt. As it is an item from the past, there may be some deterioration.
☆There is a scuff mark around 90 on the 1:600 scale. Please check the 11th image. There are no other noticeable scuffs or damage. (Apologies if I have overlooked anything.)

Please check the condition in the images and consider purchasing after understanding that this is an item inspected by an amateur and stored long-term in a private home.
Please refrain from purchasing if you are looking for a beautiful item, are strict about condition, or are sensitive.
The images may appear less beautiful than reality, and the colors may appear slightly different.
※In my own lenient subjective opinion, I thought no noticeable damage... would be okay, but considering that it's easy to overlook damage when listing items and that there are scuff marks, I will list it as slightly damaged.

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I look forward to your purchase. *~(〃^ｖ^〃)v
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