How about the following. Show us your battery labels for your nixie watches. I created this label and wear this watch through London flight crew bypass security. Tends to raise eyebrows! (Do that for the fun of being put through screening )
The hard shell on the left also accompanies my flight bag and contains my HP 41cx which can be seen in the third picture below.
I put that label on all battery pack reconstructions I do for the HP vintage calculators I restore. I love the phrase attached to them. ". These suckers will explode or leak. "
If you go to the website he have a file for the labels that you can download.
I must say the radioactive symbol on my watch, along with the watch on the wrist, get comments many times a day.