Regional (or Argive?) rather than Corinthian based on factors or material, manufacturing, and motif?
Comparanda
sim. Koutoussaki2008, p. 364, no. 645.1a, pl. LXII, fig. 491 (Thermes, Argos)
Fabric, firing, and surface description
Fabric: brownish red but fired more pale brown at surface; numerous tiny, sharp white bits and rare, medium, subangular white calcitic chunks, fine granular fracture but platy at surface. Could be Corinthian or Argive? Firing: consistently hard. Surface: smoothed shoulder and wall. Straight, rounded lateral seam.
Preservation comment
One sherd preserves ca. 25% of right top part of lamp, including discus and shoulder down to lateral edge of wickhole and small part of wall. Very slight, sparse abrasion and pitting; mostly clean breaks; very rare specks of encrustation.