Skinner sights Henry/ Mossberg rear peep sight

Excellent condition, taken off my Henry octagon barrel rifle. $100 picked up in Edmonton area or $115 shipped Canada wide. Please see description from skinners website: 

“For the Henry rifles that are drilled and tapped under the factory barrel mounted sight. (Please look under the factory rear sight) (This is for octagon barreled rifles)#H004 ~ Golden Boy's and #H001T ~ Frontier's
This sight uses the factory drilled holes on the barrel flat just forward of the receiver on the Henry Octagon rifles.These are 8-40 screw size, mounting holes are .500" C - C.  Fits  other makes and models such as the Mossberg 500/800/900 series shotguns.”