Foreign hallmarks can be fun, a lot of them can help you date the piece much more accurately than just a "Sterling" or .925 mark, British ones in particular can tell you the exact year going back as far as the 16/1700s.
I haven't been lucky enough to find foreign silver at a garage sale (well unless 925 Italy jewellery counts) but if you can find it, it often can be worth more than melt.
And whenever you find mirrors/brushes that are marked sterling it is often weighted so its hard to estimate how much its worth just by holding it in your hand so I try not to spend too terribly much on them. Same with candlesticks, those are filled with plaster and just have a thin skin of sterling. Anything marked "weighted" will have the plaster also.