Victorian rainbow spatter glass candle (?) lamp

This Victorian glass lamp is another piece which is something of a mystery. I purchased it some years ago, primarily due to it being a fine example of rainbow spatter glass - I don't know much about lamps (they look great, but do take up a lot of space, so not really trying to get a collection of them going!). The dealer said that it was a candle lamp - it has a spring loaded mechanism, which apparently raised the inserted candle as it burnt down. I don't know if this is correct, so if anyone out there knows more about this type of lamp, your input would be much appreciated! All I know is that I've not seen anything else quite like it in my collecting adventures.
It measures 33.5 cm tall, & 12.5 cm across the brass base. The glass is cased - probably white inside, with the next layer being the rainbow spatter, covered by a clear outer layer. It has a moulded swirl pattern.
It came with a clear shade, but it doesn't sit properly or look right, so I left it out of the photos, as it probably isn't original.
Bohemian perhaps?