The D Gee Model Crown from what I remember was possibly produced for some reason to do with the great exhibition.
When the book was being put together there were problems getting permission to photograph the known at that time D Gee Model Crown. The book of course needs updating as some mistakes were made at the time and more information has come to light over the years.
I can’t remember the exact details, but this came from a friend of mine, David Magnay who`s input and help in producing Rogers book can be seen in the books credits. In regard to it being number 5 off the known ones, I would guess that where you bought, and how much you paid for it, and who was the previous lucky owner, would give you a fair idea.
I do have the D Gee Model Crown in my large collection of Joseph Moore’s Model coins, together with about 40 Model Crowns, of different metals, ( silver, copper, brass, etc.) and designs, including an exceptionally rare mule.
Another area I love and covered in Rogers’s book are the Onions Teaching coins, so small that many got lost, including no doubt in children’s stomachs. There are little boxes and coin purses to hold these that are not shown in Rogers which have been since found. The metal use to make these cannot all ways be assessed as coatings of various metals was used. Out of the 90 odd that I have it would lead me to think that when completing an order, Onions may have used whatever came to hand from metal in the stock, only in later years when the coating became worn it is revealed. Mal has a good collecting of these and has I think photos some ware on this site.
Although I still add to my collections, time and tide has caught up with me and the decision to pass the collection on will have to be soon made, as I have as yet not found a way to take them with me.