how can you tell if its the newest version?
My is even younger, built in October 2007 (SN: ~15600) and there is also no germanium diode and no tuning capOk, Here's an internal pic of my Ver 4 SN: 14313 from August 2007. The pic I posted above of the supposed V4 does not look the same as mine.
I do not have the "tuning cap" or the germanium diode. The Tantulam cap is different too. The ceraminc caps in mine are the 220 not 330.