The Republic of Palau is an island country in the western Pacific, in free association with the United States. In one way or another, the country has been under US administration since it was established, and has never had its own separate currency - it has always used the US Dollar. However, Palau allows some foreign mints to issue coins under its authority; these are denominated in US Dollars but are only legal tender in Palau, so can in a way be considered to be in "Palau Dollars", even though such a currency does not officially exist.
The coins are usually dedicated to historical or general popular culture themes not related to the country itself. Many of them are in the internationally popular half gram (0.5g) of gold collector format.
The Golden Skull is part of the large Golden Highlights series of specially shaped gold mini-coins by CIT Coin Invest, and is also part of the Skulls collection.
The Mint says about it:
"It doesn’t have to be cute and cuddly every time and these CIT issues are far from it. Skull No 1, made of one ounce of fine silver, not only has a unique shape. Its smartminting relief is also outstanding in the truest sense of the word and accentuated with an antique finish. The collector’s coin is rounded off with an eerily beautiful packaging. The Golden Skull features an equally mesmerising design, albeit in the small, well-known 11 mm, 0.5 g format."
The coin is shaped like a skull. Like all other gold half grams in the special shapes series, the date of issue is not written on the coin. | 
Search for Palau: Gold Half Gram (2017) Skull on eBay 