Hygrade Watermark Detector deep tray black glass original box vintage tiny chip

Description

This listing is for a vintage Hygrade Watermark Detector deep tray black glass in original box
There's a tiny chip in the edge as shown in picture. Otherwise the item is in very good condition. Box has  wear as shown.
Instructions inside cover read 'watermark detector directions for finding watermelon a stamp with face downward so that the blank side of the stamp is seen. Pour a sufficient amount of benzene or carbona to cover the stamp. If the stamp is supposed to have a watermark, the ladder will most likely appear
Measures approx. 2.5" in x 3.25" x 7/8"
This is a pre-owned estate item Please review pictures and the description for any condition issues as they are part of the description. Simply mouse over the image and you should get a super zoomed-in view, or you can click on the image to see it larger.  The exact item(s) that is pictured is what will be shipped.
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