These aren't necessarily from Karl Hammerschmidt & Söhne, but, until I can do more research on Schunda and/or Stowasser, this is a very good place to keep them.
See http://hungaria.org/hal/folklor/tarogato
Fully Keyed - no s/n or manufacturer mark - adimar2010 on ebay
If you want to change how many album pictures per page, use CTRL+ and CTRL- (Command + and Command - if you have a Mac). 80% looks great on my 4K monitor.