Hi, I got this pencil some time ago, and until now still haven't been able to identify it... At first I thought this was a Pilot Birdie, but I can't find another Birdie that looks like this online, and it does have several major differences from the typical Birdie. The most obvious being the size and grip rings. I don't actually have a Birdie, but from the pics I've seen, this seems to be thicker and longer too, but still smaller than the usual pencil, as seen compared to a TK-Matic. It has an all metal construction, including the lead reservoir. I don't know about the chucks though,