Judging by the design it looks fairly old. Every awl I can remember since I was a kid had a plastic handle except for the higher end traditionalist type offerings. When you say collar I’m assuming you mean replacing the missing ferrule? LV sells a few different sizes but it will take years for one to develop a patina to match the awl. I’ve bought a fair number of chisels and gouges off eBay that needed handles and bought some for those but I’ve also used copper water tube for them too and it also works well.