HAS ANYONE CAME ACROSS THIS MARKING ON AN INK POT ?

Thank you for having me on this forum.

I have a green glass ink bottle with square body and

threaded rim closure. On the side of the body, it has this mark depicted on the

sketch (photo). The image is correctly viewed with the scale in the down side

of the image. Has anyone came across this marking?


Im very grateful for

any insight.

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