1700's Authentic KING GEORGE III Bookplate Engraving

Engraved bookplate which belonged to King George III of the United Kingdom, perhaps better known as "Mad King George."
Please note that this is a section of the original bookplate. It was trimmed at bottom edge before the previous owner acquired it. The scans below are very accurate for condition.
The bookplate is mounted along top edge onto a 6" x 10" gray matte board. The bookplate itself measures 4-7/8" x 4". It is engraved on thin laid paper.
Based on heraldic history, this bookplate was engraved prior to the change that took place to the coat of arms in 1801 (see history below).
The bookplate depicts the royal coat of arms as it was when George III held the throne, and features both the motto of English monarchs Dieu et mon droit (God and my right) and the motto of the Order of the Garter, Honi soit qui mal y pense (Shamed be he who thinks ill of it) on a representation of the Garter behind the shield.
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Heraldic History
When James VI of Scotland came to the throne of England in 1603, the arms changed to reflect France, England, Scotland, and Ireland (which had been ruled by the Sovereign of England since 1541). The shield was divided into four quarters. The second quarter of the coat bore the arms of Scotland, or a lion rampant gules within a double
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