Help with this moriage lamp, Nippon?

I wasn't sure where lamps should go so just putting it here. This was on the curb after an estate sale was done. I had been there twice the day before and had seen it but felt the asking price was too high for me. Free, however worked!

There is some wear to the gold but no chips anywhere. It is pretty dirty though. About 18" tall. A white silk shade in nice condition came with it. The base and collar on the top are brass I believe. I do not see a signature anywhere and can't get to the base to see it. Any info or assistance greatly appreciated.

Thanks! Linda

 

Now looking at the picture of the bottom, it appears that it is a base metal. I think spelter would be too soft.

 

Could be Nippon but you will have to take it appat and see what the bottom of the porcelain says