Regional (or Argive?) rather than Corinthian based on material, manufacturing, and motif?
Comparanda
sim. Koutoussaki2008, p. 364, no. 645.1a, pl. LXII, fig. 491 (Thermes, Argos)
Fabric, firing, surface
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.