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List of most expensive coins Price Year Type Grade Issuing country Provenance Firm Date of sale $18,900,000 1933 1933 double eagle: MS-65 CAC United States: King Farouk of Egypt: Sotheby's [1] June 8, 2021 $12,000,000 1794 Flowing Hair dollar: SP-66 CAC United States Neil, Carter Private sale [2] January 24, 2013 $9,360,000 1787 Brasher ...
In the 1930s the regenerative receiver was replaced by the superheterodyne circuit in commercial receivers due to the superheterodyne's superior performance and the falling cost of tubes. Since the advent of the transistor in 1946, the low cost of active devices has removed most of the advantage of the circuit.
References ^ "Why it is preferred to have local oscillator frequency larger than carrier frequency in superheterodyne receiver?". electronics.stackexchange.com. Retrieved 4 February 2019. Double tuned Superheterodyne receivers usually contain double tuned circuits (sets of two loosely coupled circuits) as filters in IF receiver - this is because such a filter has almost flat band instead a ...
On History Channel's hit show "Pawn Stars," a man came in to sell a 1907 Saint-Gaudens double eagle $20 gold coin. The coins are extremely rare, and some of them have sold for more than $1 million ...
The coin is dated 1987 with an engraved inscription. "Assuming the person bought the coin in 1987, they would have paid an average price that year of $520.
Police assume more than one person was involved due to the 221-pound weight of the coin -- and a ladder turned up by nearby train tracks. Famous gold coin worth $4.5 million vanishes from museum ...
Silver 2 PT, 5 PT, 10 PT and 20 PT coins continued to be issued, and a gold E£1 coin was reintroduced. Between 1922 and 1923, the gold coinage was extended to include 20 PT and 50 PT and E£1 and E£5 coins. In 1924, bronze replaced cupro-nickel in the 1m coin and the holes were removed from the other cupro-nickel coins.
The Ptolemaic dynasty introduced standard coinage to Egypt, where pre-existing native dynasties made only very limited use of coins. Egyptian gold stater was the first coin ever minted in ancient Egypt around 360 BC during the reign of pharaoh Teos of the 30th Dynasty. These coins were used to pay salaries of Greek mercenaries in his service.