Not much to say about these guts. The TR-666 uses a 2-1/4" speaker and Crown opted to place the antenna on the bottom in what appears to be a move made in favour of the design more than anything else. Judging by the parts inside, I'd place production on this sample sometime in the spring of '59.
The transistors are made by Hitachi: 2N219, 2N218 x 2, HJ62, 2N217 x 2 [SD46]
Note that I have seen earlier production units that use Hitachi ovals inside.