So far as can be discerned through the encrustation, this is standard LRA2 Southern Argolid fabric, firing, and surface treatment: thin wash with even brush marks on exterior rim.
Preservation comment
One sherd preserves 15% of rim down to joint with upper neck Somewhat worn breaks; thick, extensive encrustation.
“KTH2210 (Late Roman Amphora 2).” In Kenchreai Archaeological Archive, edited by J.L. Rife and S. Heath. The American Excavations at Kenchreai, 2013-2024. <http://kenchreai.org/kth/kth2210>