I have purchased similar boxes over the years and never paid more than $25.

BUT: If this is an International and was in the hands of the Wyper Bros.. that's different...
The Wyper Brothers of Scotland are reputed to have learned the box on one similar to the one for sale but went on to play 1/2 step 2 row boxes such as the C/C# system.


I'd risk a hundred sight unseen, maybe more if I had it in hand.