Füllhaltermuseum Handschuhsheim
During the first half of the 20. century Handschuhsheim a part of Heidelberg was at the heart of the European fountain pen industry. The Füllhaltermuseum (German for fountain pen museum), which is located in the old town hall of Handschuhsheim, pays triubute to the history of the fountain pen and the impact it had on Handschuhsheim with its rich display of partly unique exhibits.
The Füllhaltermuseum opens every 2nd und 4th Sunday of each month from 3:00 to 5:00 PM.
This is where you find the Füllhaltermuseum: Dossenheimer Landstraße 5, 69121 Heidelberg.
The entrance is located on the right hand (western) side of the building in the Mittleren Kirchgasse. Both rooms of the museum are wheel chair accessible (unfortunately the rest rooms are not). The entrance to the museum is free of charge.

You can also find the location of the Füllhaltermuseum on OpenStreetMap