Here are a bunch of keycaps.
- What switch? FYI, there are only 2 MX Switches above, using it as a guess unless you are sure is just a copout...
- Printing type (Dye Sub, Multi-Shot, Pad Printed, Engraved)
- Full points for naming the keyboard too
1.
2.
3.
4. Honeywell Hall effect 1A8S, Doubleshot, TI Telex 58SD17-2-B
5.
Yes, this one is pretty much solid plastic...
6.
7.
8.
9. Fujitsu Leaf Spring Switch 2nd generation, Doubleshot, Epson QX-10 Keyboard Q703C-AA
10.
11.
12.
13.
14. Keytronic But what keyboard?
15.
16. Doubleshot; Atari; MX Black
17. SMK (Circle with cross slider) Which keyboard/brand? (This one is semi-common)
18.
19. Amstrad CPC keyboard (which Amstrad membrane switches)
20. NMB (Clicky in this case, but it's pretty much impossible to tell from this pic)
21.
22.
23.
24. Fujitsu Leaf Spring, Dye sub, Fujitsu -> MAI Basic Four
25. Quotron, uses Scantlin switches
26.
27.
28.
29. BTC Foam'n'Foil
30.
31.
32.
33.
34.
35.
36.
37.
38.
39. Futaba Tactile, Datatrain
40.
41.
42.
43.
If some of them prove to be too difficult, I'll post more image hints.
Edit1: Adding numbers for easier parsing.
Edit2: Updating with correct guesses
and here's hoping I can get my hands on the rest of the blank space 
