I've got one of those *&%^$ Knuckles Pub badges. It came from a chap who was a member of the Empire State Land Rover Club some years ago, complete with certificate. I'll have to dig it out to check the number. I have also seen different designs too, some with the crossed leaf springs.
The one with the crown is the first, limited edition, anniversary version; there were 130 produced but only 100 issued (maybe a couple others after that). The one with the crossed leaf springs is the second edition and either 130 or 150 of them were made.
After that a few other designs were considered for another production run, but it didn't happen. Following is a link that shows a visual timeline, but the 1st and 2nd versions are switched and the page was never corrected.
http://moonlaser.com/BKP/Since then there have been several knock-off versions created and sold. IIRC the Defender crowd was the first group to do it.
You can see a larger, yellow badge on that page, it's not correct either, I've attached a pic of what they ended up looking like. I actually got to help design this one!!
That badge, and the BKP badges were created by the LRO group,, but David Walker owns the rights to the 1st version (with the crown) of the BKP badge.