The rear of the carriage swings back, as on some Smith-Coronas, to reveal the margin settings and paper support.
The line space dial
Intended as a foot, serving as a knob
"M" is for Margin
The ƒ (guilder/florin) key; touch regulator; silicone (?) typebar rest; unique ribbon spool with 9/16" ribbon
A plaque on the back indicates the store that sold the machine.
"Kantoorinstallaties" means "office installations" (machines?) in Dutch.
One big foot.