Antique Sitzendorf cherub angels porcelain electrified oil lamp

Gorgeous. The light portion works. Not the whole center lifts up out of the porcelain. Dainty porcelain. I don’t see any chips or cracks. There is a beautiful finial on top. Shade is pretty but older has has accumulated quite a bit of dust. Base is 9”. Shade is 8”. Top two baskets of bookshelf upstairs.