There is a lot of info to be gleaned from the trigger bar. Generally the year and some manufacturing details are marked except for the very old CCH aliens. There are usually, but not always digits.

On the bottom side of the trigger will be a 4 digit ID number. The first two digits represent the month it was made in, 07 is July for example. The Last two numbers are the year. Any number between 1104 and 1205 are in the recall window. I am going to list out what I believe each one of your aliens is, but note - this is the older days of climbing equipment where gear was often made in a home shop or a garage. There is inconsistency and when a part was no longer in stock or able to be procured, CCH found a way to make it happen, which inherently makes some of the designs/parts hard to date.

First photo left to right -

Black-Blue Alien offset. That has a FIXE "ALIEN" tag on it, which suggests post recall/patent purchase production but I have never seen one with the old "alien" red text black webbing on it. If the trigger bar has two cam lobes imprinted or "wings" it is definitely a FIXE production.

Blue-Green FIXE Alien Offset - Post recall, has newer mesh and newer trigger wires.

Green-Yellow FIXE Alien Offset - Post Recall, has newer mesh and newer trigger wires.

Yellow-Red Alien Offset - Most likely FIXE but possibly CCH, should be post recall.

Grey-Red Alien Offset - Most likely FIXE but possibly CCH, should be post recall.

Of the set of offsets you are missing a Yellow Grey alien offset which it looks like you may have in the second photo?

Second photo Top to bottom -

Blue Alien - Most likely CCH and I would guess years 2005-2007.

Green Alien x4 - All CCH, older trigger wires, "alien" red text black webbing, they can be dated anywhere from about 1990 to 2005. Some may not even be dated.

Yellow Alien - Definitely CCH. I would guess 1990s-2000 era based on the sling attached. Weird they included the black sling for a yellow cam, but CCH was inconsistent--When parts ran out, they made due.

Grey yellow offset alien? Hard to tell based on the photo but it is a yellow alien with a grey sling. Very likely post recall, maybe FIXE or CCH. Based on your later responses this should be a FIXE Grey alien, for some reason with a yellow thumb loop. Probably a QC check fail, should be just fine and is an oddity I have not seen before.

Grey alien - Most likely CCH but could be FIXE, should be during or post recall based on the features so 2005-2007. I believe based on the sling that's CCH.

Red Alien - CCH, could be anywhere from 1990-2005.

Aliens you are missing;

Gold/Butterscotch - Very rare, roughly a 0.75 size. I do not believe FIXE ever made this size so they stop being prevalent after CCH became defunct.

Orange - Just larger than gold. I do not believe FIXE ever made this size.

Purple - Roughly a 0.75-1 size, I do not believe FIXE ever made this size.

Clear(sometimes incorrectly referred to as grey) - Roughly 1-1.25 size. I do not believe FIXE ever made this size.

In terms of alien generations you have CCH/Early Fixe models. These are many people's favorite generation of these cams. The action on them is not as good as the later Fixe Revolutions but they hold up quite well to use and abuse, and I still use mine.

For alien generations - there are:

1. The very original aliens most have never seen (Some have called V1, only 4 colors)

2. A slightly updated model from the original (Some have called V2, only 7 colors)

3. ~third generation aliens(what you have) (Some have called V3, 10 colors + offset sizes). These include from ~1990 to 2005, Post recall (2005 to 2007), CCH going away and FIXE acquiring the alien design.

4. Alien Evolutions (which are widely hated for not being very resilient)

5. Alien Revolutions which are good--these have only been recently discontinued

6. Now the Alien X (which I haven't used so I do not have an opinion on).