EGP Self Seal Double Window 8 5/8 x 3 5/8 - 250 envelopes Pricing is for 250 envelopes Self-Seal Double Window 8 5/8 x 3 5/8 Upper Window 3 3/4 x 7/8 and 3/8 from left and 2 5/16 from bottom. Lower Window 3 3/4 x 15/16 and 3/4 from left and 11/16 from bottom.