Thanks for replies. Mine has no half-ring spacer or whatever that is on the top. I'm going to pull off the mic cover and see what the capsule it looks like in daylight. There could have been a lighting issue. This mic is a Blue rebuild, apparently late 2002. Nothing much original in there at this point, I don't suppose. Maybe the tube. I was hoping the capsule was correct. I'll post of photo with daylight lighting.
From Dave Bock:
The differences between the blue47 and an original are:
Different capsule (does not sound the same in the bass)
Different tube type - in you case it has the orignal AC701 tube
Different amplification system (active plate load not simple resistor, sounds different-lowers noise but changes distortion charachteristics)
Different tube bias system (changes dynamic response)
Completely different transformer (different laminations and it's not a four section winding like the original, of course, will sound different)
nice film caps on the output (unlike the original, these aren't as non-linear as the originals but the output caps on most of those fifty year old U47's should be changed to film by now anyway)
Different tube mounting system (affects handling noise & non-linear distortions) - again if yours has the original tube it is the original mounting system.
Completely different power sypply (will sound different than original circuit, but theirs is ok so it's a matter of taste regarding your personal preference)
Something else: In 1960 Neumann also changed the capsule in the M49 to the PE/goldplated diaphragm - you may have mostly original mic!