This is a pretty little antique Scottish Monart Glass Bowl. I have five near identical ones listed on my website.
It dates to around the 1920s - and has the original paper label on the base - which tells you this is size X (5 inches in diameter) and the shape is classified as ZA. 260 is the colour code.
The bowl is made of opaque white mottled glass with a blue mottled glass rim and cased in clear. It is about 5 inches in diameter at the widest point and with a height of 2 1/2 inches.
As you can see from my photographs - it is a lovely tactile piece and sits nicely in your hand.
Lots of images were taken for your inspection - although there are inherently small differences in the patterning in each wee bowl - the shape, size, colours etc are almost identical.
It shall be sent to you with Royal Mail Tracked postage in the UK - for one bowl this will cost £5.50
Postage for more than one bowl would be capped at £11.