SILVER, not "sliver", and not an "E" mint mark. The US has never used an E designation. The only mint marks on Bicentennial dollars are D (Denver) and S (San Francisco), located above the date. 1976 coins struck in Philadelphia do not carry a mint mark.
About $27.
42cents
About $150.
"DO" isn't a mint mark. The mint mark on a silver dollar for that year is on the reverse (tails) side, just above the letters "do" in the word "dollar."
The value of a dollar coin would depend upon the date it was minted, the mint mark and the condition of the coin.
Assuming no mint mark and the coin is circulated retail values are $16.00-$68.00
If it has one, it's just above the eagles tail near the rim.
Face value unless it has the mint mark "S".
About $27.
42cents
About $150.
100
One Dollar
Unfortunately, your German mark is only worth $1-$2 depending on its condition. This mark is very common and does not have a high value.
"DO" isn't a mint mark. The mint mark on a silver dollar for that year is on the reverse (tails) side, just above the letters "do" in the word "dollar."
at todays value a US dollar is less the 2 marks on the market
The value of a dollar coin would depend upon the date it was minted, the mint mark and the condition of the coin.