In September 1865 plate proof impressions were taken from the one penny Plate 66 after it had been withdrawn from use.
In Black with Large Crown watermark inverted
Upon examining the many references for additional information on
these proofs one discovers that there is not much known about their origin
or purpose. They are apparently referred to as the "Royal Reprints"
based upon an un-confirmed story that they were printed by request of the
Royal Family because they wanted to provide them with examples of the Penny
Black. In The Encyclopedia of British Empire Postage Stamps,
Vol. I, Great Britain and The Empire in Europe, they are listed without
explanation. In The Postage Stamps Of Great Britain, Part II,
The Perforated Line-Engraved Issues, it is mentioned that they
were printed in black, and the reader is referred to E. D.
Bacon's The Line-Engraved Postage Stamps of Great Britain as their
source without any further information. Stanley Gibbons, calls
them "The So-Called "Royal Reprints," without providing any information
other than their characteristics, in their Queen Victoria Specialized
Stamp Catalog, 10th Ed. Therefore I would be pleased to
receive further information about these proofs if anyone can be of assistance.