Where is this tower, likely photographed in Belgium about 100 years ago?

This photograph is labelled as "restoration of a Belgian tower" and taken between 1920 and 1930, although both pieces of information might be wrong. However, it must have been taken before 1935 because the photographer died in that year and that piece of metadata is likely to be correct.

I'm trying to find out what tower is it and its location. I've tried checking images of Belgian towers to no avail - maybe I haven't tried hard enough.

The image can also be seen in Wikimedia Commons at https://commons.wikimedia.org/wiki/File:Restauraci%C3%B3_d%E2%80%99una_torre_medieval_en_una_ciutat_belga.jpeg and in its original location at http://mdc.csuc.cat/cdm/singleitem/collection/ffmgausachs/id/171/rec/284 with some metadata.

A bit of context:

Some thousands of old public domain images were recently imported from a Catalan archive to Wikimedia Commons. Most of them were properly identified but there is a big lot with lacking or wrong information - that's the reason I wrote that the location and date should be taken with a grain of salt. Thanks to a very dedicated Catalan Wikipedia editor and some crowd-sourced expertise, identification of those advances fairly well. However, some of the images - like this one - were taken in other places of Europe far away from Catalonia and I think that identifying landmarks on them will be easier for a more international audience. Since it's a voyage photograph (although the voyager passed away in 1935) I think it's on topic here, a good addition to the site and an interesting challenge for some users, while providing a valuable little piece of information for the benefit of common humankind knowledge by allowing the image to be properly identified in Wikimedia Commons.