Some 120 Osaka examples:
I bought mine many years ago. At that time (assuming my 50 year old memory is working) Bromwell had a ?30? day return policy if you didn't like the lens http://www.bromwellmarketing.com/
After reading this thread, I now doubt that Congo and Osaka are the same lenses. They may come from the same plant, but the maximum f/stops are different between the two lines.