This is a very beautiful and embossed coin in very good preservation and I am very interested in your opinion about it. Her weight is 8 grams
Like this: https://www.acsearch.info/search.html?id=2579701 Year is not so clear, but your coin might be ET ς too. Small differences in the legenda.
Yes it is a date ET followed by a number which could be year 3 to year 8 for this type. ISEGRIM list four types for year 6. Non with a completely fitting legend. 1. CAPPADOCIA, Caesareia. 226-227 AD. AE. Obverse: AY K SEOYH ALEXAN; PORTRAIT MAN R / SEV. ALEXANDER (WREATH LAUREL). Reverse: MHTRO KAISA ET S'; FRUITS 3 CORN-EARS . YEAR S' <6>. 1. 22.86mm SLG HUNTER page 595 #89 2. CAPPADOCIA, Caesareia. 226-227 AD. AE. Obverse: AY K SEOYH ALEXANDR; PORTRAIT MAN R / SEV. ALEXANDER (WREATH LAUREL). Reverse: MHTR KAIS ET S'; FRUITS 3 CORN-EARS . YEAR S' <6>. 1. 19.05mm BMC Galatia, Cappadocia and Syria p. 89, #318, SYDENHAM CAES. 570 3. CAPPADOCIA, Caesareia. 226-227 AD. AE. Obverse: AY K SEOY ALEXAND; PORTRAIT MAN R / SEV. ALEXANDER (WREATH LAUREL). Reverse: MHTRO KAISA ET S'; FRUITS 3 CORN-EARS . YEAR S' <6>. . 6.6g SNG von Aulock #6519 4. CAPPADOCIA, Caesareia. 226-227 AD. AE. Obverse: AYT SEOYHR ALEXANDRO; PORTRAIT MAN R / SEV. ALEXANDER (WREATH LAUREL). Reverse: MHTRO KAIS ET S'; FRUITS 3 CORN-EARS . YEAR S' <6>. 1. 20mm SYDENHAM CAES. 572, MIONNET 4 page 434 #191
Your coin is what it called a Roman provincial. The legends can vary a lot on these. Technically, yes, it is very rare compared to, say, modern coins, but so are most Roman provincials, so the rarity does not translate into value. My guess is that your coin--well worn but still attractive--is worth somewhere between $20-$40. But keep in mind that prices can fluctuate widely with provincials.