Pet Heater Thermostat

This is a mini pet heater and mini thermostat.
It was used normally, but has been stored in a storage room for about six months.
As it is a used item, there are likely some scratches and dirt, but I believe it is relatively clean (this is my subjective opinion).
I believe it was originally 100v 20w when purchased, but I may have replaced the bulb with a 30w one.
I do not remember how long it was used after the replacement, so it may be best to purchase a spare bulb.
Please only purchase if you understand this.