Anniversary Commemorative

How much is my gold coin worth?
I have a 22k gold-proof Samoan 100 tala coin. It was made in 1978 to commemorate the 50 year anniversary of the first transpacific airplane crossing. It is in its original packaging with commemorative postage stamps included. It is about 2.5 inchs in diameter.
Can anybody tell me a resonable range of value for this coin?
Rob, you must be way off on the size of this coin. I estimate the diameter to be 1-1/2″ or less. This coin has the national arms on the obverse side and a globe with a plane flying across the Pacific Ocean and a portrait of Lindbergh facing left on the reverse side. The coin weighs 15.55 grams (1/2 troy ounce). The actual gold weight is 0.4584 oz. 22k gold (.917 fine) is correct.
Based on todays gold price of $1,210/oz. the gold content as a bullion coin is worth $555.
While only 1,500 of these coins were minted in 1978, there simply is no great demand for it in numismatic circles. If the coin is still in full lustre proof like condition it might carry a 10-20% premium, say for a value of about $650.
City of Heroes – Retrospective (6th Anniversary Commemorative Video)