I've tried to see if I could get a high quality vector out of your image, but was unable. I think it could be a combination of the background nearly matching the coin, in addition to shadows.
That being said. When I was doing my military logos, I ended up on fiverr.com and had somebody do a vector trace. I've done it in Adobe Illustrator, but I was looking for somebody to pickup the workload and I'd throw a few dollars their way.
By no means am I suggesting a specific person, but I used: https://www.fiverr.com/kopralzz
and he produced an excellent vector from a .bmp. I've had him do a few images for me, and he is who I'll go to in the future.
(Former TSgt, now CW3