Silver plated copper wound or silver plated copper alloy wound strings are the strings of choice for Selmer style guitar. This material gives the right tone and indeed, was the standard wrap material for acoustic steel guitar strings until the introduction of bronze in the early 1960's.
The most popular strings for Selmer style guitar are Argentine (10 - 45 and 11 - 46 gauge) in ball end and loop end. I stock full sets and single strings for spares. I also stock Galli gypsy strings in 11 - 47 gauge.
A recent search on the net revealed that my price for Argentine Strings is the lowest you will find in the UK - You can now buy direct from here. Clicking the "Buy Now" button will show the current price without any obligation to complete the purchase.