The below pictures originated from the 1921 photo shoot made in honour of Klaas Pieter Plantinga's 75th birthday. These were kindly provided by Gerrit Herman Plantinga (b. 1929, great-grandson of Klaas Plantinga).
The first, second, third and fifth picture are from the Dijkstraat 7 address; the others might be from Dijkstraat 7, Grootzand 6 or 't Laag 42-44.
1: The interior of the shop. The barrels built into the wall were part of the pre-1870 inventory and were explicitly mentioned in the sales agreement.
2: The office behind the shop. You can see the wall of the first picture on the right, through the glass.
3:The 'small office' ('kleine kantoor') on a half-floor between the working- and living-quarters, for use by management.