If you are asking about a small (13mm) 1853 Liberty Head gold dollar, the mintmarks are on the reverse under the wreath.
mint mark is to the left of the value on the reverse.
With no mint mark or an "S", about $1000. That could go up to $1500 with a CC mint mark.
depending on condition, about $300
On the reverse just to the left of the arrows
The P is the mint mark for Philadelphia.
With no mint mark, around $1000 With a D or S mint mark, $1000 to $1500 depending on condition. has a g mark
Starting in 2009 the date & mintmark was moved to the edge of the coin, it's not gold and it's only a dollar.
With a CC mint mark, $850 to $1500 retail, depending on the amount of wear.With an S mint mark, $750 to $800
A date is needed. Post new question.
The mint mark on a $5 gold coin from that era is on the reverse (tails) side, just below the eagle.
There is no mint mark on the 1921 Peace dollar because they were all minted in Philadelphia and thus carry no mint mark.
The mint mark on any Morgan dollar is on the reverse above the letters DO in dollar.