Jeff,
May I make a little suggestion? If you are taking pictures of a particular detail, and there's another detail in the background that we have more definitive information on, you might want to capture that background detail in the picture. This may better nail down the timeframe etc.
In particular in these photos, I see the one that has the maintenance decal horizontal. We already have a pretty good idea of timeframe when the decals were being placed vertically.
BC