For Ron's reference, see:
https://i.ebayimg.com/images/g/KPUAAOSww85acENd/s-l1600.jpg

For Julia's references, see:
Vetusta monumenta : quae ad rerum britannicarum memoriam conseruandam / Societasantiquariorum Londini sumptu suo edenda curavit. (https://catalog.hathitrust.org/Record/100807769)
https://babel.hathitrust.org/cgi/pt?id=mou.010014268400;view=2up;seq=224;size=150

Bruce Bartelt writes:

Bob Van Arsdell seems to have been right when he ended up with "It's possible the book may not have been a numismatic one", basedon his earlier comment that "the coin was well-known by the 18th Century, so it didn't warrant the elaborate title if was included in a plateof many coins in a numismatic work."

However, he was wrong in guessing that it "could be an in-line plate in a page of text".

In fact, it is a full-page plate, see https://i.ebayimg.com/images/g/KPUAAOSww85acENd/s-l1600.jpg

It is/was plate lvi (56) of Volume I of "Vetusta Monumenta ..." (Society of Antiquaries of London, published 1747 though theplate is dated 1739) - and also in Volume 1 of Lord Oxford's collection (which I haven't yet tracked down, unless it's the salecatalogue).

See https://en.wikipedia.org/wiki/Vetusta_Monumenta and https://en.wikipedia.org/wiki/Society_of_Antiquaries_of_London

In "NOTES FROM E-SYLUM READERS: MARCH 26, 2017" you labelled me as "Googler-in-Chief" !!! Well, explorations like this can bevery hard work - this is how I did it.

I noticed that the caption starts with "the exportable piece of eight ...".

1: Google this, for BOOKS (WITH the quotes, which mean "exact phrase"): "the exportable piece of eight"

2: This gives one hit - investigate! It is referenced on page 358 of Volume 70 of the Walpole Society, (re)published/digitized 4 Nov2008.

3. The reference-number "811" looks significant, so search the book for this number - it also appears on p.395.

4: Now Google this: "Walpole Society" Volume 70

5: The first hit is https://www.jstor.org/stable/i40086491

6: Go there (click on the heading of the "hit"): The Table of Contents shows: GEORGE VERTUE AS AN ENGRAVER (pp. 207-517) by DavidAlexander at https://www.jstor.org/stable/41830020

7: Go there (click on the link).

8: Click on the "Read Online (Free)" button.

9: If not already logged in, either log in or sign up (free to access up to 6 articles per month).

10: Use the "thumbnails" tab to navigate to p.358.

11: Take a good look at this reference and the preceding one (811 & 810). Observe that there is a reference to "Lord Oxford": Thiswould be Edward Harley, 2nd Earl of Oxford and Earl Mortimer (1689-1741), see https://en.wikipedia.org/wiki/Edward_Harley,_2nd_Earl_of_Oxford_and_Earl_Mortimernot his son, the 3rd Earl, who immediately sold off the collections! [Do not confuse with the Earl of Orford, e.g. the 4th Earl, Horatio"Horace" Walpole (1717-1797).]

12. Note that the previous reference (810) mentions "a gold coin of mary queen of scots" so make a note of this.

13. See also p.394 & 395 - we see that (as expected) we want Plate 56 of Volume 1, originally issued at price one shilling and three pence(£0.0625 or $0.25).

14: See also the "References" tab, and scroll down to read the bits on "Vetusta Monumenta" and "Walpole,1762".

15: Google the phrase from step 12, and get lucky!

16. Click on the first hit, to find somebody selling the plate on eBay for $39.99, item #173129496294

17. Note the date of the engraving (1739), and use this in step 19.

18. Click on "Visit store".

19. Search that eBay store for: COINS 1739

20. One of the four hits is what we want, so click on it: item #173129489368 "Coins Struck in France and Flanders Relating to England -QUARTER FLOREN -1739"

21: See also https://books.google.co.uk/books?id=ntc_AQAAMAAJ&pg=PA418

So: It is the lowest piece illustrated on a full-page plate is by George Vertue. These plates were available both loose (this one was £0.0625) ANDbound or gathered into a volume (for some 11.4% more than the individual total).

P.S. To find out more about this engraver, try https://en.wikipedia.org/wiki/George_Vertue

He was official engraver to the Society of Antiquaries. Additionally he produced a numismatic work which deserves to be better known than it is:Medals, coins, great seals, and other works of Thomas Simon, engraved and described by George Vertue. Printed by J. Nichols, printer to theSociety of Antiquaries. (1780 - 27 pages), see https://books.google.co.uk/books?id=yWAGAAAAQAAJ&printsec=frontcover#v=onepage&q&f=false

To read the earlier E-Sylum articles, see:
NOTES FROM E-SYLUM READERS: JULY 22, 2018 : Query: Book Cutting IdentificationSought (http://www.coinbooks.org/v21/esylum_v21n29a17.html))
BOOK CUTTING IDENTIFICATION THOUGHTS(http://www.coinbooks.org/v21/esylum_v21n30a10.html)