This is a very vague question. There are a wide range of 17th century gold coins that I could give you a number of answers to. Here is a list of what specifications you will need and I can give you an exact value, both numismatic and melt.
Country it is from
Denomination (how much was it worth back then in local currency)
Exact date or ruler
Condition (which there is a slight possibility I could provide for you based on the above)
Once you have all of these specifications I will be more than happy to answer you're question.
There is no 29 Franc gold coin. If you mean 20 francs it is worth about $250.
A coin collector is going to buy my coin , I want to know what the value of this coin, it is a 1953 gold coin ,50 franks
I'm assuming you mean the Sacajawea Dollar which is minted in gold-coloured brass (Susan B Anthony dollars were last minted in 1999) it is a common coin struck in brass and not gold and is worth $1.
The aureus was a gold coin of ancient Rome. The aureus was used from the 1st century BC tthrough the start of the 4th century AD.
A "gold" 1979 Susan B Anthony dollar would be a regular dollar coated in gold (or gold paint). Numismatically, it's worth about a dollar. If it is coated with real gold AND it is a thick enough to be worth anything AND you could get the gold off, it might be worth a bit more (especially if you could salvage the coin itself for a dollar). Broadly speaking, "collectable coins", such as this, aren't.
If the coin is actually made from gold, it will be worth whatever the gold content is worth. If it is a coin of gold appearance, it will maybe be worth whatever you paid for it.
Gold
The coin is a Sacagawea dollar, it has no gold and is worth $1.00
The coin has .12094oz of pure gold, the coin is worth $165.40 just for the gold.
It depends. An older gold coin is worth more as a coin if it is in mint condition. That means it looks perfect. It was never used. If it is worn or damaged, it might be worth more for its weight in gold.
A Canadian $20.00 gold coin is worth around $400.00
It depends on which denomination coin you have. A $10 coin has more gold than a $5 coin.
You are likely referring to the large aluminum-bronze coin (no gold content), picturing 17th century Sister Juana de Asbaje on front. In perfect uncirculated condition, this coin would have a value of approximately $5.75 to a collector - and in circulated condition, up to $2.
a gold coin
What is a1968 gratia Regina f.d elizabeth 11gratia gold coin worth?
The value of a 1990 Eisenhower gold commemorative coin depends on the condition of the coin. On average the coin would be worth approximately $26.
A 1889 gold 5 pound coin is worth 5 pounds of gold, while a 1889 2 pound gold coin is only worth 2 pounds of gold.