I would think an original and un-cracked Embassy is so rare, and kool, that they should be in the $5g range. T-birds are relatively common in comparison and Gibson bass fans being as peculiar as they are, the name on the headstock shouldn't matter a bit. But that is me, and vintage dealers are different and name means more. I am old enough, and passed on my first Embassy around the tail end of the Carter administration. I have passed on at least 5 times as many Tbirds - I never learn - but always felt the Embassy was a better balanced bass, with a lighter, if not more fragile, feel. And real nice tone.
Chicago Music used to have a very early natural Ravioli with banjo pegs as I recall, back when they were on Clark. Back then maybe they were asking a few grand. Way too much then, but only time I saw one that old. The had an EB0 for years with some freaky owner-modified banjo pegs for a few grand more than everyone else. That being said they were always more reasonable than the Mandolin Brothers out on Fantasy Island, and Gruhn on everything but Gibson basses.