The S could stand for Specksioneer, (various spellings). Whaling term for Chief harpooner who supervised the cutting up of the whale blubber (speck).
The Davis Strait fishery between Greenland and Baffin Island was an important whale fishery in the 18th and 19th century. There are some good books on the subject. Scottish, Tyneside, Whitby and Hull whalers used to hunt the fishery.