It's a version of the Omega Vintage Database, frozen in time from about 2010. The current version has a lot more references, but less information on each one.
If you are trying to convert from vintage Swiss francs to current US dollars, don't just look at inflation. You need to adjust for the depreciation of the dollar against the franc over the period of time. Back in the 1960's a US dollar bought about 4 Francs. Today it's about even par.
So if a website tells you that a price should have gone up by a factor of 5:1 based on a dollar to dollar inflation measurement, the real conversion is more like 20:1 when you're moving from Francs to US dollars.
Another way to put this is to look for the economic power or relative output worth of the older amount, not just the dollar inflation measurement based on the consumer price index (CPI).
https://www.measuringworth.com/uscompare/result.php?year_source=1968&amount=175&year_result=2016
The above shows the approximate US price of a new Speedmaster in 1968, inflated to 2016 dollars. While still a dollar to dollar measurement, you'll note that the relative output worth is very close to the 20:1 ratio above.
Hope this helps,
gatorcpa
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