Without pictures of it flowing, it may not be worth $5
I would price this lamp at 15-25.00
The lamp is vintage and looks to be in good condition with no hazing in the liquid. In other words it's really clear liquid. The flow of these lamps is very boring. This lamp also tips over very easily when bumped unlike most lavalite lamps. I would offer 15.00 nothing more however I'm not thinking of buying the lamp you are so if the lamps rings your bell buy it.
Yes, top-heavy, boring flow. I wouldn't buy it.