A transitional form showing this basic outline but overall heavier can be designated Hayes 87CB/109 or Bonifay2004 Sigillée type 60 variante précoce (last third 6th century): e.g., Aupert1980 no. 417 (Argos)
Bibliography
Bonifay2004, pp. 186-189, fig. 99 (Sigillée type 60)
Dish with flat base or tiny ring foot, low curving wall, and plain, rounded lip marked inside by a groove. Coarse fabric with inconsistent slip inside and over lip; spiral-burnishing on floor. Somewhat common Early Byzantine form. Bonifay distinguishes three subtypes. 109A: rounded lip and relatively thick walls. 109B: overall shorter, sometimes flattened rim and relatively thin walls, with slip-painted concentric bands. 109C: tiny ring-foot and rim formed as flattened triangle.