By Mark Grimek; posted March 26, 2018 View Original: Click to zoom, then click to magnify (1386 x 1608) 421KB
Short variant with wide wire groove.
{front skirt} PYREX / REG. U.S. PAT. OFF. / MADE IN U.S.A. {rear skirt} [blot out : REG. U.S. PAT. OFF. ] / number 9 / PAT. APPD. FOR
