Deletion of internal P{wen.6} of P{2(wen.6)}6-6B leaving single P{wen.6} at position 680 of the esg gene (coordinates as in FBrf0057128, bp 1000 is the beginning of the coding region), in opposite orientation to that of esg.
In a w- background, eyes of homozygotes have an orange ring while heterozygotes have eyes with a light orange ring.
P element insertion is at the esg locus.