Lancaster Antiques has dated this piece to the 1930s.
They measure 15.5cm in height, with a 14cm wide base (at the widest points). The gap at the top will fit most modern lamp holders and measures approximately 3cm.
They are white inside - see last photo. Both shades are in excellent condition, with just the slightest nick at the edge of the shade on the right in the main photo at the very bottom.

We have several boxes of original glass shades, and some can be seen on our own website lancasterantiques@ymail.com.
Postage and packing within the UK mainland only is included in the price and for remote parts of the UK or abroad, please contact us for a quote.
Lancaster Antiques has dated this piece to the 1930s.
You can view the stock and full dealer information on the Lancaster Antiques Profile Page