Swirled rainbow satin glass vase

This is an interesting & attractive small vase that I found on eBay US, a rare international purchase.
It is made from three layers of cased glass, milky white with a satin finish, over clear, with a swirl of rainbow colours forming the innermost layer.
The exterior has a fine swirling ribbed pattern. It measures 12.5 cm tall, 7.4 cm across the top rim, & 5.5 cm across the base.
The form is simple, & reminds me of an unfooted type of celery vase.
I am not 100% certain of the age or origin. The vase is in perfect condition with no damage or signs of wear, yet the technique & decor suggest a possible Victorian origin. The satin finish has the velvety smooth texture found only on 19th century satin glass.