Does anybody stealing eyepieces in the dark stop to check and see if they are engraved before pocketing the EP? That would amaze me.
Glad it's worked for you.
It's not dark...I have a red light in the shell for reading charts and the eps and engravings are easily seen.
The other advantage to engraving your eps is when you are trading eps around with other observers...it's easy to get confused at 3AM. This has happened a couple of times in the past. For some reason TV (or anyone else AFAIK) doesn't have serial numbers on their eps to identify one from other.