Hi,
I am new to this forum and just purchased my first Omega. The same one that you have pictured here. It is the Omega Speedmaster Automatic Date - 3511.50 - Black Dial. It has a Calibre 1155 with Rhodium subdials.
I got this one
cgi.ebay.com
.m14&_trkparms=65%3A12|66%3A2|39%3A1|72%3A1205|240%3A1318|301%3A0|293%3A1|294%3A50
Regards,
Prashant.