i/8 of an inch
Your $5.00 gold coin is a 1/10 ounce gold Bullion coin, the letters MB are the initials of Miley Busiek, she designed the reverse of the coin.
See related answers.
MS stands for 'Mint State' meaning a coin that shows no wear or damage from circulation.
If you mean: 5/8 then it is 62.5%
VG-8 means "Very Good" and scores an 8 on a scale from 1 being barely recognizable to 70 being absolute perfection. Coins grading VG-8 are usually very worn, but most of the text on the coin is still readable.
It means that on the grading scale of 1 to 70 it received an 8 in condition. This means that the coin is very worn.
Coins are graded on a 70 point grading system known as the sheldon scale. VG-8 stands for Very Good 8/70
A certified example of this popular error coin graded as a brown VG-8 has an average retail value in the $700.00 range.
Speed Coin - 1984 VG was released on: USA: 1984
Regardless of mint mark, retail as of 9-7-11 is about $265.00 in the grade of VG-8.
If the coin is in a collectible condition and in the grade VG-8 retail list is $225.00
You should have your coin authenticated by one of the major grading services. Numismedia lists its retail value as of 11/2008 as $610, assuming a condition of VG-8. An F-12 is shown at $900 so it's important to see where in the range it falls, especially if it is a choice coin that could grade at VG-10 or so.
Retail for this coin in G-4 to VG-8 is $16.00-$20.00
VG=Video Game
A silver 3 cent 1852 coin in very good (VG-8) condition is worth: $50.00; in a mint state of MS-60, its value is: $200.00
Tank 8 - 1976 VG was released on: USA: 1976