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Usually near a year old before a d'anver gets a spur, I do have some 2 year olds with just nubs still, then I have some 1 year olds with 1 inchers already, again that's an individual thing, but on average at least 1 year before any form of noticable spur will show.
As for eggs, hens can start at 6 months. Any stress will stop them in their tracks usually though, and they often stop in mid stride for a few days to a couple weeks at times threw the season.
I would say after all they went threw, and young age, you should be getting eggs again in 1-2 weeks after they adjust to their new home.
And yes, looking at the pics, and your discription, I'd guess them as late summer hatch, most likely about 9 months old, which is plenty old enough to reproduce, just give them a little time to settle in. They lay very well, but stress will stop them every time.