I like the idea of a badge, and i have some suggestions about the approach. First: most but not all members will want one, and these will not be inexpensive to produce. In fact, if we need to employ design resources (which I believe will probably be needed to turn out a badge that effectively reflects the pride of ownership so evident among group members) the cost will run in the neighborhood of a year's membership for each badge at a production run of 2,000. Not a big deal to most, but I believe it argues against making this a membership benefit as opposed to an individual option. Second, design is not easy. There are some great suggestions in this thread but, imo, they are not on the marque (sorry). A grill badge is an emblem, and it should serve as a symbol of a particular quality or concept related to the group and/or the W113. A pic of a W113 is, imo, too literal and complicated to serve as an emblem. Perhaps there is a member with professional logo design experience? If not, I would support retaining someone.
Hope the helps and does not offend,
g