Beautiful Large Regular Sebenza, I have one just like it, though its plain of course. One of my favorite CGG Designs.
If you have an invoice from CRK, then its a good chance they did it. It looks like their work as I have had custom engraving done by them. I was always told they can only do ONE line of engraving on the back, because of the limited space. But it looks from this one, they were able to fit two lines on just fine.
CRK's engraving is not just letters scratched deeply into the TI like your used to seeing at the places at the mall and such. They actually use a computerized millinging machine that has a carbide or cobalt tip that spins like a drill and moves back and forth in the smallest movements to form the letters or designs. Almost like a wood router.........I worked at my uncle's business when I was younger for 11 years and we did computerized engraving. Most of it was just scribing the letters into aluminum or brass plates for awards and such, but we had attachments that would allow us to do how CRK does it, but it was just not economical for us from a $$ standpoint as it took forever. I have spoken to Heather about their engraving and what can and cant be done quite extensively. It was a nice learning process for us both that has served us quite well over the years.
When you get words or designs done by CRK, that design becomes yours. If someone else wants it, CRK has to asks your permission to use it. I still get emails from Heather from time to time telling me someone wants my NCIS engraving on a sebenza and that she needs my permission to do so. I have never or would never deny a request, i think its nice that someone likes mine enough that they would want one like it also.........And with that, you can see as " marthinus " stated, that they have knowledge and records of all engravings and custom work that leaves their shop.
Ironically, I EDC a Large Regular Sebenza with CGG engraving thats says " In God We Trust ".