lot of large assorted antique white porcelain nail insulators

Lot of 5 large old white porcelain, two piece, nail insulators. Three of them are marked - P.P. Inc - 9420 - and measure 2" across and 2 1/4" long. The two smaller insulators measure 1 3/4" long and 1 1/2" across. They are marked -M-.

These have age and minor chipping.