Hello, manufacturers marks on electroplated cutlery can have meanings but may only be "decorative" to appear like marks on solid hallmarked silver. Sarl and Sons would have been the retailer of the item and no doubt could have asked for any lettering they wanted. The Sarl "ads" say they used Argentina Silver for their silver plate alloy and but if they were commissioning the items the could have decided to call it "Sarls Silver" with the abbreviation "SS". On some retailed items there is a chance that marks could have an association with the manufacturer of the item. The 3 leaf pictorial mark could be one of those.
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Fishless