If all of this is true about receiving the gold and funds then your friend would likely be able to find a good attorney who will work on a contract that stipulates his/her payment when the funds arrive. This seems like the best course of action. As for the British VI coins, these are typically sold as bullion so their value will be intimately tied to the bullion value of silver. The 1899 set of US gold coins obviously carry a numismatic premium, but if they are not strictly MS then their value is closely tied to bullion, too. Good luck.
To answer your original question, based on closed ebay auctions, I've seen those coins sell for anywhere between $7 and $25 ea. I don't know about the dipped Jefferson. IMO it's a damaged coin and I wouldn't want it in my collection. I also don't know about melt value seeming how it would take an awful lot of refinement to get such a small amount of platinum out...it's probably more trouble than it's worth. Now for my unsolicited advice If your friend has made equal sacrifices in your friendship, sell your coins, as he would've done or has done the same for you. But if you have to think long and hard and really dig down deep to find the last time he did something equally as nice for you, then I would hang onto your coins/money and let him figure it out by himself. -LTB
Whats more important, your coins or your friend? Sell the coins. It's not like your selling the crown jewels. You can get replacement coins like that any time you want.
It seems that most of the $20.00 British Virgin Island Silver Dollar coins minted in 1985 by the Franklin Mint are/were valued at around $15.00. If you do some calculations to see if it might be worth more as melt , it isn't. total coin weight = 19.0900 grams composition of coin = 0.9250 Silver Actual Silver Weight = .5677 ounces Silver as of this posting is $18.08 per ounce. Trying to sell .925 silver brings a lower melt value than .900 coinage ( something to do with the toxicity created by the other materials in .925 silver during the smelting process ) Your $20.00 British Virgin Island Silver Dollars coin is probably only worth $15.00 unless someone REALLY wants that particular specimen. There were over 25 versions of the $20.00 British Virgin Island Silver Dollars coin minted in 1985. Senior members please correct my assumptions and calculations if I have made an error.