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Metrological standard measure for eggs

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Tools and Hardware7572 of 9713Caliper(s)who knows what this is
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    Posted 9 years ago

    TheRoper
    (39 items)

    Metrological standard measure for eggs;

    The inscription reads: “Association of the Exporters of eggs and poultry in Bulgaria” with dimension mark above “40 75 m/m". The measurement with a caliper gave exactly 40.75 mm, which is incredible, having in mind how much rust I’ve got to remove.
    The specific sign Yat (http://upload.wikimedia.org/wikipedia/commons/thumb/4/48/Cyrillic_letter_Yat.svg/150px-Cyrillic_letter_Yat.svg.png), removed with communist’s orthography reform gives me a clue it has been in use at least before 1945, but I will not be surprised if it is from the begining of the XX century, most likely c. 1920-1939;

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