Lustre cups

Another blip of desperation... These handleless cups are old, in that they were old when I was a small girl - I have no idea when they were made, or whose they were. They are not particularly fine, but the copper lustreware with that blue band is characteristic of some of the examples I've been able to find online.

They used to stand at either end of the mantlepiece in my parents' house, and when we cleared the house I knew I wanted them, and a lustreware jug as well, because they'd always been part of my life and I'd admired them when I was little.

I know they're not valuable, but if anyone can throw any light on when cups like that were made, I'd be grateful.