Despite having almost the same weight 16.17 g. and 16.51, these 2 Tets of Alexander The Great differ in size around half a centimeter : 28 mm and 33 mm. I didn't clean them yet, awaiting your comments.
I'm new to this field of valuable silver raw Greek coins. Other coins of the same series are being offered to me. Well the question might involve method of cleaning, known varieties, authenticity, value, advice on further purchases etc...
if you really wanted to use a scanner then you need an Epson. They focus to high enough. This better than my iphone for sure.
Well, for beginners I would not recommend cleaning them at all. Not unless you are OK with destroying the coin and losing what you paid for them. Cleaning can be difficult and has been discussed many times. Check the archives for those topics. The varieties of Alexander style tetradrachms are numerous and extend well after he died. In fact most were struck after he died. Uncleaned coins like this likely average maybe $50 each. They look decent from the scans. If properly cleaned probably an average of $175-300 depending entirely on how they turn out when done. But, proper cleaning will cost you if done by an expert, so depending on what you paid for them it may not be worth having them done. Just up to you. Unless you are getting these super cheap I would suggest paying an average price for coins which are already cleaned (or even some that never needed cleaning to begin with).