You can find a complete 1955 Omega catalogue with pricing here. http://omega-constellation-collectors.blogspot.ca/
And use this site, for example, to find out the price today.... http://www.usinflationcalculator.com/ Just my 2 cnts
Not the way to do it, I'm afraid. You also have to adjust for the depreciation of the US dollar vs. the Swiss Franc. That's at least another factor of 4. So if a watch sold for US$200 (approx. Sfr. 800) in 1955 and US$1 at that time is equivalent to $8.85 today, you'd need to multiply as follows: $200 X 8.85 X 4 = $7,080 in 2016. Maybe that's why new Swiss watches are so expensive. gatorcpa
Here is another site that has ads many with prices for watches back in the day: http://www.vintageadbrowser.com
Yes, it is the Omega version called the Synchrobeat, an ill-fated piece of engineering. as was the Rolex version, that was retired with some embarrassment. Cheers desmond