I hope you’ll have one in the future: my brass Low D in particular is fantastic. I’ve got a Goldie’s Overton and an MK as well, which I love, but this Copeland’s is very different, look wise and sound wise. I like to play it to have a different feeling, it’s a different beast. It’s almost a mythical instrument! 
Thanks a lot JTC and MT for your help. 
Well, I made some researchs on the forum, and i found those posts:
-
serial number 2136: 2000
Help: Michael Copeland's serial numbers -
2180: 2002 or before:
2 Burke Ds and a Copeland Low D for sale or trade -
2278: 2002 or before:
Copeland "D" whistle for sale -
2373: before 2004:
Copeland Low F - For Sale -
2474: 2002 or before:
Would like to Trade my Copeland High D for Sindt C, D & Eb -
2507: 2002 or before:
Copeland sop D - For Sale -
2788: before 2004
Copeland High D -
3228: 2003:
https://forums.chiffandfipple.com/t/fs-copeland-sterling-silver-low-d-whistle-sold/62418/1 -
3329: 2003 or before:
Copeland Low D in Sterling Silver for sale -
3770: march 2006:
FS - Copeland Hi-D Nickel and Hudson Wind -
3949: 2008 or 2007:
https://forums.chiffandfipple.com/t/wtb-sterling-silver-copeland-high-d/62765/1
