Scott 128ai, 2c green, Part Perforate Coils, Sheet form, XF, Mint, p8, 17.5mm,  King George V "Admiral", 1924.
NOTE:  These stamps were "stuck" to another sheet and a clean "lift" was unsuccessful with "Super Safe Stamp Lift".  Hence, the gum issues and discoloration.  NH value of this sheet is $1000 CDN.