I picked up this Sina Fumor Vanguard on eBay the other night. Steve Laug has a Reborn Pipes blog on a similar Sina, which was made by a GBD off-shoot. You can read more about Sina here:
I have not seen a Sina with such nice grain, I gather that is where the "Fumo Vanguard" title comes from. My pipe has a more standard button shape so it is not as old as the one in the blog. (I'm not a fan of orific buttons).
The pipe is coming from Belgium, so I won't have it in hand for a while. Pictures below are from the eBay ad.