Th OPs single shot is a beauty and he should be proud to own it and shoot it as should any model SS owner; after-all, these are "hen's teeth"!
....and just to add confusion to rct259s lengthy and confusing discourse, my own 3rd Single Shot #9843 Does Not Have an Olympic chamber.
I restored mine a couple of decades ago because I like them so much. I tightened up and timed the action, hand-polished all of the metalwork to 600grit, Steve Moeller charcoal blued it, Turnbull case colored the hammer and trigger and Michael Dubber gold inlay the barrel markings. I made a set of fancy French walnut target grips and inlaid my SDH 24kt gold hallmark in the bottom.