Looking for information about inherited tea set

I have a tea set that I inherited. I want to know more about them but most importantly, where they were made, when, and how much they are worth. Any information would be great, as my friend and I are at a complete loss. So far we know that they are bone china.
Tea cup: 9.2cm diameter, 6cm tall,
Sugar pot: handle to handle 17cm, 9.6cm tall
Tea pot: tip of spout to end of handle 15.2cm, 8cm tall

 

More likely a creamer, than a teapot, to go with the sugar bowl.

Do you have the lids for the sugar & creamer? The under-plate/saucer for the tea cup? If all those items are missing the value is very low.

 

Sadly those are lost! As for resell value, I have no interest in ever selling them, but I would like to know more about where they came from and what time period they are from.

 

I'll stick my neck out and say Japanese, unmarked Nippon, and 40s. Not worth much but still rather lovely