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  1. https://link.springer.com/content/pdf/10.1007/BF03214762.pdf Interesting article on "Origin and Effects of Impurities in High Purity Gold"
  2. Chards have posted this before on their web site: - https://www.chards.co.uk/blog/analysis-of-alloy-content-of-gold-sovereigns/180
  3. I found some answers to my question above at: - https://en.wikipedia.org/wiki/Mint-made_errors#Overdates_and_overmintmarks
  4. How are coins with for e.g. "F" over an inverted "A" produced or corrected? Would a batch of coins with inverted "A"s be produced in error and then re stamped with a corrected die? If so how would the original faulty coins be aligned prior to re-stamping? Are they manually corrected with and individual single letter punch, or some other process?
  5. Hotdog

    999.9 Gold Colour

    Unless my eyes are acting up, there is also a difference in the slight swirl pattern in the field area in way of the Queen's head, in the left hand coin the swirl action is clockwise, and the right hand coin the pattern swirl is anti-clockwise.
  6. Can anyone advise what the physical process was to over stamp dates or letters? Were they done manually or by machine? One number or letter at a time, with an individual punch??
  7. My view....... is that the 1816 coinage act states that gold coins should meet the standards of existing gold coins on a pro rata basis i.e. the Gold Guinea which was in existence already and had a clearly defined purity (which was to become the same standard for Sovereigns, but at a pro rata value/size of 20 shillings as opposed to the Guinea of 21 shillings. As far as I've read there is no other definition of the Sovereign in the 1860 coinage act, but it follows on in 20/21 proportional value to the existing Gold Guinea with the same Gold/Alloy mixture. My view again is that the act states for the mint to get on and make such gold coins as required, but doesn't define dimensional attributes. I'm guessing that the mint then came up with a gold alloy coin(same alloy ratio as the Guinea as required by the 1816 act) with a value of 20 shillings (which was the value being discussed in parliament in 2011). I'm "guessing" again that the mint decided on the physical dimensions/design of the sovereign following the only other requirement by law that was to have have the 11 parts gold and 1 part alloy. Only my interpretation, and happy to be corrected.
  8. Another reference from 1811 Hansard: - https://hansard.parliament.uk/Commons/1811-05-06/debates/18a47646-0915-435a-9140-cf8cc635dfe1/ReportOfTheBullionCommittee—MrHornerSResolutions
  9. Another reference: - Lisle, George (1906). "British Currency: Gold". Accounting in Theory and Practice . William Green & Sons. p. 277.
  10. My assumption.....It follows from the coinage act of 1816 also known as the Liverpool act. 22 carat gold was fixed at a value of £46-14s-6d per pound. Sovereigns were to have a value of £1. 20lbs weight would have cost 20 x (£46-14s-6d) = £934.5 hence there would be 934.5 Sovereigns to 20lbs. Troy weight of 22 carat Gold.
  11. As a general observation, I guess Ansells's book would be of interest to to those that wish to delve further in to the history/manufacture of the Gold Sovereign. A copy/reprint is available on a well known book website for a tenner. The book covers some of the politics/personalities involved as well as the physical manufacture of Sovereigns around the year 1856, when there were some issues to be resolved. In todays parlance some of it would be seen as office politics (managing of people and egos), but in engineering terms as hands on resolving of problems, Ansell was the man that was required. In hindsight it may appear that the problems were easy to resolve, but that would be an over simplification where both practical and local politics would have presented considerable difficulties to those of lesser resolve.
  12. Reading "The Royal Mint" its working, conduct, and operations, fully and practically explained by George Fredrick Ansell, he comments that "The law enacts that 20lbs. troy of standard or crown gold shall be made into 934.50 sovereigns." It follows that the weight of a single sovereign is 123.2744783306581059 troy grains, i.e. 7.9880518266452649 grams; though reading further it becomes more complex with regards to the permitted tolerance. Reprints of Ansell's book are available online.
  13. As Silver and Copper have different densities, do the earlier sovereigns that used the different alloying metals have differing dimensions?
  14. Pete, what thickness did you obtain using G-shaped micrometer? I've noted 1.08mm to 1.09mm when checking in way of field areas on a 2020 sovs.
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