David Whitten posted a picture of a glass shard with what looked like a double struck 4 in the help/questions folder asking if people thought it could be an insulator shard [id=511093870]. I have been going through my insulators trying to organize them, and I found this green B beehive with a similar (but not identical) double struck or ghosted 4 on the dome (and a strong 1 next to it that could have a slight ghosting). Both 4s are so sharp that it really looks like a double strike when embossing.