How hard are these to find?

[GeoffD]

I've recently started actively looking to round out my Omega collection with these harder to find items .........

The early Seamaster c321 with the flat pushers

http://farm1.static.flickr.com/188/406791930_f7f8ae45dc_o.jpg

Can anyone help with the Omega ref no. for this?


The 376.0822 Speedie Pro with the Cal 1045

http://farm2.static.flickr.com/1402/1022396662_6c2ed5ab86_o.jpg



The 176.004 Seamaster 120 auto

http://farm2.static.flickr.com/1262/1022447778_0c855e7cf1_o.jpg


and finally the original Constellation "pie pan" from 1952, but must be a '52
once again an Omega ref no would be appreciated.

http://farm2.static.flickr.com/1081/1022397108_32c56386b8_o.jpg



Any info on just how hard to locate these might be and ball-park pricing estimates would help a great deal.

Thanks