Belgian banknotes King Albert I (part 6)

The last banknote that I will present in this set of King Albert I- notes, is the 5 Francs (or 1 Belga).
There are 3 types of this banknote, and they were issued as follows :

Type 1 : Issued from 1.4.1922 till 25.6.1926 (Krause n° 93)
Type 2 : Issued from 14.6.1926 till 10.5.1931 (Krause n° 97)
Type 3 : Issued from 1.3.1938 till 11.5.1938 (Krause n° 108)

Each of these types appear with 2 different signature varieties.

Type 1 has no text in the white circle where the watermark can be found.
Type 2 has both words "Trésorerie / Thesaurie" on the front of the banknote
Type 3 has the French 3 "Trésorerie" on the front and the Dutch "Thesaurie" on the back

So far, I  don't have a copy of  Type 1.

Krause - Belgium n° 97 (Type 2)

Detail type 2 - Krause n° 97

Detail type 3 - Krause n° 108

3 different printing dates : first last series of Type 2 - 2 prints of Type 3

On the back side of the banknote, we see a miner sitting and looking over a mining area.
Just behind him, the towers of the mines can be found.

Back of Type 3 - Krause n° 108

detail Krause n° 108 - miner and tower

Prices varie from 1 € in used condition, to 25 € in perfect condition.