TO ANYONE OTHER THAN AN extremely well-informed observer, it is just a sparkplug. A Bosch sparkplug, not that you’re asking. It’s a little bit oily and while in obviously perfect condition, has clearly spent at least some time in its originally intended role of igniting a fuel/air mixture within an internal combustion engine before finding its way via registered mail to me. Yes, this month someone really did send me a used sparkplug in the post.