Help with ? Ancient Greek Coin?

Skamaniac

Hello. I am looking for some assistance with a potential ancient Greek coin. I have attached rough photos of the coin. My uncle purchased this coin back in 1971 from the Guardian Trust Company in Montreal, Canada. He kept records of purchases and his note states "Greek 336 - 323 BC Silver Tetradrachm Alexander III the Great".
I have found very little information for the Guardian Trust Company.

I weighed the coin on a grain scale and it weighs between 265 and 266 grains (17.17 - 17.24 grams).

So my questions are:
1) How does one determine if this is the real deal, fake, or high quality museum replica?
2) If it is the real deal, what would be its approximate value.
3) If it is the real deal what is the best way to sell the coin.

Any help or assistance that can be provided would be greatly appreciated.

BillDugan1959

Not my area of expertise.

If you have a dealer's receipt, you should guard it almost as carefully as the coin. Many dealers/dealerships are ephemeral, but old paperwork suggesting that the piece was purchased as the real thing may be something that adds confidence whenever the piece is next sold.

I know that Time-Life Books once upon a time gave away Greek coin replicas to help sell sets of history-related fancy books.

numismagram

Though it is difficult to tell from the quality of the images, there doesn't appear to be anything overtly off with the style for the type. Reference-wise, it corresponds to Price 3579, which would be the mint of Babylon near the end of his reign. Given the off-centering of each side and the spots of deposits/discoloration, it would probably bring somewhere in the $150-250 range at auction.

Skamaniac

Thanks for both responses. Would Great Collections would be an appropriate auction avenue?