This is what i have found on the Schacht Travenar 2.8 50 Its a page in the 1960 sales catalogue.
the page is damaged so i can't be really sure about the price but from what i can make up it was 1830 belgium francs
the lens was still present in later catalogues but by 1962 the price has risen to 3280 Bef !
The travenar was the second "cheapest" 50mm 2.8 available for the Edixa the cheapest being the Steinhell cassar S at 980 Bef (half the price of the travenar in 1960)
I don't know if the travenar dates back to before 1960 as my references stop there.
The ad says : "the bigger part of these lenses are equiped with an automatic pre-selector"
Since your travenar is in black i suppose it's from a later date, i'll check on that...
BR, thanks for the Edixa advertising.
In terms of average incomes what were the Edixa prices like and how did they compare with their Japanese competition.