here is more info of the coins
img1.jpg - 16mm , 3.18g
img2.jpg - 30mm, 12.27g
img3.jpg - 28mm, 16.96g
hope this will help for correct identification .... for img3 on the back where it is zeus on the left there is flower and i cant find on internet same coin
This is why it’s important to also post weights and diameters for identifying unknown coins.
With those metrics, the first coin is obviously not a tetradrachm. I would assume it’s a drachm (one quarter of a tetradrachm). Tetradrachms of this period in typical circulated condition would usually be around 17g although there are variations with exact date of issue and also between the many mints throughout the empire.
A drachm would be a quarter of that… a little over 4g but occasionally just below 4g, even if not substantially worn. Yours, at 3.18g is outside the usual range, but not impossibly so. It’s also possible it might have been ‘clipped’ (in contemporary times) to dishonestly remove some of the silver.
The third coin is bang-on typical weight and diameter for an early Alexandrian tetradrachm, but the second one is unusually light… although, again, not impossibly so. Again. ‘clipping’ is a possibility. Dimensions varied considerably, the flans generally ranging from about 26mm (on a thick flan) and reaching up to about 37mm (on a thinner flan but to the same weight) at the end of Alexander’s reign and through to posthumous issues still bearing his name.
I haven’t seen that particular ‘flower’ emblem either, but I wouldn’t worry too much about that. They’re generally referred to as ‘mintmarks’ but the truth is that there is uncertainty about what, exactly, they signify… and there are a myriad of variations. Emblems for town/cities where mints were located (there were a lot of them)? Identifiers for moneyers authorised to produce coins? Symbols used by particular die engravers? Some coins have them and some don’t. Sometimes the city/town name for the mint appears as well in Greek characters, or as an abbreviation, and sometimes not. Some coins have neither.