I was wondering if this nixie clock comes with a case to hold the pcb board. I really like this one but I fear that dust would get on the board and cause the clock to malfunction over the years.

This clock does not come with a case yet, and I am working on it, but not sure when it will be available. I have a few my clocks running without cases for years and it works fine, so dust does not affect clock functionality at all, unless you going to use it in some very dusty and wet conditions ( like workshops, garages and etc.), but I do not recommend it. Just use soft brush once per month/year and it will be OK...