Info on pins for a newbie

[LFJ]

I have zero experience with militaria and I need help. I purchased these in a jewelry lot (which is my area of experience). I'm guessing the first three are sweetheart pins (I have multiples of these). The next two are pins put on NS Meyer cards but are not marked as such (I have multiples of these). The 11th airborne pin (I have multiples of these)??? The last set are also pins put on NS Meyer card but not marked as such.

1. Are they authentic, fake, reproductions?
2. Time period?
3. Value?
4. Can I sell the NS Meyer cards seperate to collectors for their real pin? And I sell the unmarked pins seperately?

Any and all advice and information would be helpful. Thank you in advance.

[Walkwolf]

All appear to be US 'Sweetheart' pins. Some linked to specific units.........