Help ID American pottery mark - Triangle w/ 462

by Maureen Riley
(London, Ontario, Canada)

I have a small light green jug with a handle, resembling a pineapple. The handle has two curls at the top of handle where it meets the jug, On the bottom (which is clear of glaze as is the inside), there is a triangle (point down), with the numbers 462 above the triangle; Inside the triangle there are three lines (I read these are sometimes called firing pin marks.)