I've been looking at pics of 12ks and trying to research their origins and learn about their different parts. (LOL!! I must admit that I am secretly obsessing over these beautiful looking machines and that one should possibly find its way to live with me

)
I know that they were extremely popular, lots were made and made dear Issac lots of money.
I noticed though that there appears to be different styles of bobbin winders but the manual pics that I've seen do not show them.
http://needlebar.org/main/manuals/singer12k/index.html
Does anyone have a model 12 or 12k? I'm thinking that these bobbin winders may have changed due to development of the design changes and tweaking to make it more efficient.
- does anyone know where I can research the time lines on the changes in winder designs and the dates they may have occurred? Is one more efficient than the other? Problems of the different designs?
- regular looking with no extra parts:
http://needlebar.org/nbwiki/index.php/File:12.jpg
- use of a paddle like extension
http://www.ebay.com/itm/THE-BEST-SIN...item4187eae38c
- the video on this one shows just an extended upright bar with a loop
http://www.ebay.com/itm/Old-Vintage-...item5b045b59a7
- an unusual diagonal setup
http://www.ebay.co.uk/itm/Amazing-An...item418888e1e0
Am I crazy to start looking for one or for a machine from that time era? any advice? any info?
Alex Askaroff has a video of the copycat German Superba and wow is she quiet!!- and a different style of winder - I'm drooling
https://www.youtube.com/watch?v=B-u3ObYZDRo
Deb