Help Identifying Ancient Silver Coin

He can find a lot of genuine examples on Wild Winds, but our reticence to have hitherto replied is that these are often faked.

Below is a genuine example of the Rhodes AR Tetradrachm from Wild Winds:

http://wildwinds.com/coins/greece/r.../BMC_122.txt

<--- The one over there I use for my avatar is real, if a bit "squashed" - these coins are rarely perfectly round, more often egg-shaped, but the forum admins here stretched the pic out to 100x100 size. So the roundness of the coin in the top pic is the first-glance giveaway to me that it probably isn't legit. I'm also not aware of Rhodian didrachms or tetradrachms with two clusters of grapes; there's often one cluster, but only one. I suspect the modern artist was striving to recreate what he assumed was some lost symmetry that did not actually exist on the coin he was copying.