Ad blocker detected: Our website is made possible by displaying online advertisements to our visitors. Please consider supporting us by disabling your ad blocker on our website.
Hello, that is from Czechoslowakia. The '4' stands for 835/1000 parts silver. If the background of the '4' (I cannot see it clearly on my screen) is checkered, it is the mark introduced in 1942. If it just depicts three slopes, it is the one introduced in 1927. 'WL' is probabaly the maker - sorry, haven't got a clue. Best wishes, Bahner