markings are on a silver-looking fork and a spoon; they were in a bunch with a few austrian alpaca bachmann/wien, so i checked for austrian then german and hungarian, no luck. the numbers are 135-51 and 216-51 / i assume if anything we care just about the 51, but i was wrong before so...
before 51 there is a very small marking maybe OC or OG but it could be 66 as well, or a faulty marking.
after 51 there is also a small marking but big enough to see a crown with 5 points / 2 in the background and a bottom band inside a pointing down triangle.
i don't have a silver tester but a hydrochloric acid that makes iron foam and smoke doesn't attack them/ but that only tells us what is not.
in the same bundle there were a few 800 forks, so it wasn't only cheap stuff.
thanks in advance. also glad to see the forum is still alive, i've checked here stuff maybe 8-9 years ago!