Europe indeed Germany and Switzerland.
Perhaps we have found a possible candidate for the retailers mark ST. ELOY
The House of ST. ELOY Rotterdam.Albertus Eduard Maria van der Loo (1878-1960), in 1901 founder and director of N.V. Het Huis van St. Eloy, jewelry traders registered in Rotterdam. He and his son and successor Joost Albertus van der Loo(1907-1985) learned the jewelry trade in Germany and Switzerland.
The House of St. Eloy in the beginning till the mid seventies was a very exclusive establishment, exclusively for people of the highest welfare class. In addition to jewelry, The House of ST. ELOY also traded in exclusive high-quality silver.
In 1924 the jewelry trading house registered an importer’s mark for silver & gold objects:
A vd (conjoined) L3 + for A. van der Loo, Rotterdam, registered 1924-1953. In 1953- present importer's mark;
StE+ registered for; Het Huis van Sint Eloy and 1990-present maker’s mark;
*StE*In view of the jewelry study of the van der Loo family in Germany and Switzerland, they could have built up a trading relationship with the firm Pochon Frères & Co.
Perhaps in their
early year The House of St. Eloy, as retailer marked imported (big) silver items with
ST.ELOY ? NB. Fineness
830S is below legal minimum Dutch standard mark silver
833 fineness used 1814-1953.

Lot number 26, Views: 3
A five-part combined silver tea/coffee set The set German, maker's mark Het Huis van St. Eloy b.v., Rotterdam, serving tray Haarlem, 1948, A. Presburg Comprising a coffee pot, a teapot, a creamer, a sugar bowl and a serving tray. First and second grade silver, approx. gross weight 2373 grams H. 21 / 15.5 / 10 / 4.5 / L. 47.5 cm Provenance: - Auction Christie's Amsterdam, 6 December 1983, lot 609 - Private collection, The Netherlands (5x)



Will try to contact The house of ST. ELOY and ask if it is correct.
Peter.