How to Determine the Value Of or Redeem an Old Bearer Bond

[Stewball]

Texas

My father passed away several years ago and left me three "Lloyd's Bearer Contracts". The contracts are from 1965, and claim the value of 10,000 ounces of refined silver(each), with a interest value of 6% per annum. I have tried to contact the institution/bank involved to no avail, I am lucky to even get a real person on the line and when I do I am directed to another department. It seems that the issue is that the contracts are not in any modern record system. Here is the contract verbatim:


"Lloyd's Bearer Contract - Aug - 1, 1965

For value received in the form of commodity exchange payment of Twelve Thousand Nine Hundred Thirty Dollars ($12,930), the Establishment of Lloyd's of Liechtenstein, Vaduz, Liechtenstein, hereby irrevocably agrees to pay to the Bearer on demand, ninety months after date, in United States Dollars, the value of ten thousand (10,000) troy ounces of refined silver 999 fineness, with interest in silver value at the rate of six percent (6%) per annum, at the silver market price, on the date of payment, on the Commodity Exchange, Inc., New York City, N. Y., U.S.A., with a guaranteed minimum payment of Twenty Thousand Dollars ($20,00) to secure the Bearer against any loss of principal or interest due to the decrease in the silver market price, any speculative profit due to increase in silver market price accruing to benefit of the Bearer in additional payment to the guaranteed minimum payment under this contract.

Signed, Sealed and Delivered, As of Vaduz, Liechtenstein"


Does anyone have any idea where I can go from here?
Would it be necessary to contact an attorney? If so, what type of attorney?
Do the contracts seem solid?


Edit:
I also have a "Confirmed, Irrevocable, assignable, secured, uncancellable, divisible letter of credit." that dictates that the contract is payable at the Imperial Bank of Commerce.

[Mr. Knowitall]

You would start by contacting Lloyd's of Liechtenstein to see if they can provide information about the bond or how to redeem it. You could also try to figure out which "Imperial Bank of Commerce" is referenced on the bond, and inquire with them. If you were to hire a lawyer, it would likely be appropriate to hire one in Liechtenstein. There may be a secondary market for the bond, although there are issues in selling bearer bonds due to their past use for drug trafficking and money laundering so I'm not sure whether it's possible to lawfully sell the bond in the U.S.