Z28 cowl paint (and Z11/Z10)

[X33RS]

Yes the black stripe cars are painted in this manor as well.  I can't speak for all because different times of the year and different plants, but I can tell you for certain mine is this way and is unrestored.
  12D Norwood and the top of my cowl definitely has gloss black sprayed on the top of the cowl and it quickly fades to a flatter black as it transitions to the firewall.   It's much harder to see but as I'm carefully cleaning this car it became apparent there are 2 different blacks there.
  I would imagine restored black stripe cars probably don't even bother with this little detail so you won't see many done this way (shucks even white stripe cars aren't done this way on most restorations that I see).  I will duplicate this however just as I see it on mine.  Very easy to fade it in being black and black, and will likely go unnoticed by most people.

Edit:  If it helps verify, I just noticed the very first picture that Kurt put in the first post.  You can clearly see the gloss black on top of the cowl that fades to the flatter black, on a black stripe car.  Much later car than mine but appears to be very close to the same.  However mine has much better coverage of the black as I can see no frost green showing through anywhere on the cowl or firewall area.  Guess they were much more generous with the blackout that day on my car.

X33...  My unrrestored Z28  (09C of 1969) is the same as yours... more glossy black coverage on top of the cowl...

Do you have any orange showing through like some of them I'm seeing?   Mine has excellent black coverage with no frost green bleeding through anywhere. 

[69Z28-RS]

....
Do you have any orange showing through like some of them I'm seeing?   Mine has excellent black coverage with no frost green bleeding through anywhere. 

Not sure I'd call it 'bleeding thru', but certainly where the black has flecked off.. see photo...

[X33RS]

Okay, you're up under the cowl.  I haven't removed my cowl yet.  I was more referring to the area where the cowl transitions to the firewall.  I see a lot of poor coverage of black in that area on some cars where the body color is bleeding through.

Looking at that picture, I see yours is generously covered with black just like mine.  Weird how our cars are so far apart yet built similar.

Another interesting note.  I see green "PTB" on the driver side of your firewall.  My car was done in Orange but only on the passenger side.  I see remnants of it, that's it.  I have found nothing on the driver side at all.

[69Z28-RS]

My car only had the PTB stamps on the drivers side, in green... and actually there's a 'second' T faintly below the trim tag... like the fella did it..  and then said..  'I believe I can do it better!)..

[X33RS]

Ah, so you have PTB on one side too, just on the left side instead of the right side.    Every car I see has both sides stamped.  Neat to see another one done similar to mine.   Are you sure that's not a December car 

[69Z28-RS]

Ah, so you have PTB on one side too, just on the left side instead of the right side.    Every car I see has both sides stamped.  Neat to see another one done similar to mine.   Are you sure that's not a December car 

It seems the great majority of the 'restored cars'...  are stamped on both sides in both colors...   

[firstgenaddict]

They were more likely to have been worn or rubbed off on the pass side, due to not being behind the master, Gary, I can't explain yours. It was an ink and not paint so it didn't take much to rub it off.

[69Z28-RS]

I've owned the car since 1976, and never noticed the existence of the stamp marks until 2 or 3 yrs ago, and after reading JohnZ's believable explanation of what they meant, I checked and found what I found.  It was more recent than that, after removing my Booster/MC for rebuild that I found a faint '2nd' T mark below the cowl tag. 

As far as explanation, I'm not sure what you mean unless its why they aren't on both sides on all cars?  I suspect that situation is due to having a single person doing that inspection in the Fisher plant, rather than one on each side of the car.

[ko-lek-tor]

I cannot comment on the both side of cowl stamp. I only have found one set on the LH side (Yes, a Dec. car). Someone got a little creative with my stamp. Not absolutely sure on the B..it is (was) very faint. For posterity's sake.

[X33RS]

So that makes 2 December cars with only a single PTB stamp.  We might be on to something then.  Mine is only on the right hand side though.  I see nothing at all behind or around the booster anywhere.

[firstgenaddict]

So that makes 2 December cars with only a single PTB stamp.  We might be on to something then.  Mine is only on the right hand side though.  I see nothing at all behind or around the booster anywhere.

The Silver car I posted is a 12C with stamps on both sides.  I have seen many many with 2 T's on the drivers, I don't know if it was a T to check for the T trim tag and a T for Trim.

[68camaroz28]

So that makes 2 December cars with only a single PTB stamp.  We might be on to something then.  Mine is only on the right hand side though.  I see nothing at all behind or around the booster anywhere.

The Silver car I posted is a 12C with stamps on both sides.  I have seen many many with 2 T's on the drivers, I don't know if it was a T to check for the T trim tag and a T for Trim.

I've noticed that also James with two "T's" on the drivers side and it seems one is always upside down or at least on the ones I've checked. Recently noted a 67 with the "T" under the fender drivers side which I have read is quite common.

[X33RS]

So that makes 2 December cars with only a single PTB stamp.  We might be on to something then.  Mine is only on the right hand side though.  I see nothing at all behind or around the booster anywhere.

The Silver car I posted is a 12C with stamps on both sides.  I have seen many many with 2 T's on the drivers, I don't know if it was a T to check for the T trim tag and a T for Trim.

Hmm, wonder why mine isn't showing anything there.  I would tend to think that stamps on the driver side would have a better chance of surviving since it's hidden out of the way behind the booster and what not.  But oddly partials of mine survived on the passenger side.
Is the stamp on one side not very commonly seen?   I never understood why they would have 2 sets anyway but that's what I see on unrestored and restored cars.   It's as if they had 2 inspectors that had to stamp the cars?

[69Z28-RS]

So that makes 2 December cars with only a single PTB stamp.  We might be on to something then.  Mine is only on the right hand side though.  I see nothing at all behind or around the booster anywhere.

The Silver car I posted is a 12C with stamps on both sides.  I have seen many many with 2 T's on the drivers, I don't know if it was a T to check for the T trim tag and a T for Trim.

Now THAT is an idea... that makes sense.. a T to verify that the trim tag is in place... (the 2nd one on mine is light and below the trim tag and I believe I've seen another one or two cars which have T stamps identical to that)..

[firstgenaddict]