Could you please post a new question with more complete data? If you are referring to U.S. coinage, there were no Bicentennial coins issued in 1988.
The 2 U.S bicentennial issues were of course dual-dated 1776-1976 coins for the Declaration of Independence, plus 1987 coins for the Constitution's 200th anniversary.
All Australian Two Dollar coins are HH coins. HH is the initials of the designer of the reverse, Horst Hahne. The HH inscription only appeared on the 1988 and 1989 coins. There were 160,852,100 1988 coins minted. There were 31,637,800 1989 coins minted.
The coins are copper-nickel and made in the Marshall Islands.
A bicentennial marks 200 years.
200 years.
200 years
The 1988 Ten Dollar coin commemorates Australia's Bicentenary and features "The First Fleet Landing". The coin was released in "Uncirculated" (111,497) and "Proof" (80,099). The coins are composed of 92.5% silver and 7.5% copper, weigh 20 grams and are 34 mm in diameter with a reeded edge. Current values are - "Uncirculated" $20 AUD and "Proof" $40 AUD. A reputable coin dealer will be able to give a more accurate valuation.
There were 1,000 1988 Isle of Man Proof gold "One Angel" coins minted.
There is no predetermined limit for coins minted for general circulation. The number of coins made for the year depends on the economy.
Authentic coins were made of copper. Many replicas and fake coins made from "base metal" exist.
1000 were made
For 1998, the mintage data for coins issued for circulation is 15,665,368,500.
All genuine British Sovereign coins produced since 1817 are made from 22 carat gold. Unfortunately, there are many counterfeit coins around that will be made from anything but gold. Also, there are many "facsimile" coins around. These are legally made coins which resemble the real thing, but should have a marking on them indicating that they are a "facsimile" coin.