So far as can be discerned through the weathering, this is standard LRA2 Southern Argolid fabric, firing, and surface treatment: faint broad turning bands across neck.
Preservation comment
One sherd preserves 10% of rim and part of middle to upper neck. Slight chipping along edges; worn breaks; thick encrustation covers most of surface.
“KTH2438 (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/kth2438>