I tried searching the internet for a bit but couldn’t find any discussions regarding Shiro knives and scale markings but either way, I think it’s neat to have one like this.
There's a brief discussion of L40 markings on F95 scales here. And there's also a reference to Nick Shabazz video with L31 markings.
According to the reply these A00-style labels were made to simply match the scales intended to be used for the same knife.
So,

