Good morning sir! Good to see you here.
I've only handled one old Chinese sword, that belonged to Rsword. So I'm not at all qualified to say, but I'm 99% sure, as you are, that they are recent. Based on the sellers other items, and the laws of probablility only. Also, for the pattern to show like it does, someone would have had to etch them, and therefore would have known what they were. But at the price you paid, they are very nice decorators.
I've paid more for worse.
We'll see what the experts say.
Happy Ebay hunting!
Steve