This only represents my opinion based on the photos, and the limited knowledge I have on the individual types.
#1 Medusa
This is a small coin and has a grainy corroded surface indicative of a coin of that size and age or at least that is the impression given by the photos.
#2 Helmet
I have always avoided this coin very good black sea hoard fakes were struck in the '90s and this type of heavily copied. I have see a few for sale known of which I was 100% of its authenticity. That is not say coin is fake but I would look very closely at the FORVM fake data base and the links posted in the stickies. I believe this type is covered in-dept with several fake dies available to compare. I havent checked their recently for your coin but its worth the exercise in this case.
# 3 Chersonesos
I believe to be authentic. These are one of the most common types of ancient Greek coinage. It is readily available in all grades. Fakes have been made but I am comfortable enough that the wear on the coin is honest.
# 4 Siglos
There is no doubt in my mind that this authentic.
#1 Medusa
This is a small coin and has a grainy corroded surface indicative of a coin of that size and age or at least that is the impression given by the photos.
#2 Helmet
I have always avoided this coin very good black sea hoard fakes were struck in the '90s and this type of heavily copied. I have see a few for sale known of which I was 100% of its authenticity. That is not say coin is fake but I would look very closely at the FORVM fake data base and the links posted in the stickies. I believe this type is covered in-dept with several fake dies available to compare. I havent checked their recently for your coin but its worth the exercise in this case.
# 3 Chersonesos
I believe to be authentic. These are one of the most common types of ancient Greek coinage. It is readily available in all grades. Fakes have been made but I am comfortable enough that the wear on the coin is honest.
# 4 Siglos
There is no doubt in my mind that this authentic.



























