Yup, I'd be happy with that SKS at the price offered
The crack looks very repairable. If it were mine, I'd:
Heat to bleed out the Cosmoline,
rinse the crack with mineral spirits and finish with acetone to degrease as much as possible (avoiding getting the acetone on any intact shellac outer finish),
cut a couple of sections of 1/16" dowel if there's enough thickness (or thin brads),
drill out holes from above for the dowel with a 1/16" drill bit and sand down the dowel pieces a bit to reduce the diameter,
fill the crack with glue by spreading it carefully if you can or by dragging a piece of paper wetted on both sides with glue through the crack, and fill the holes with glue,
insert over-length pieces of dowel,
clamp and dry,
cut off the dowels flush (dab of stain on the endwood of the dowel) and you're good to go.