Our fonts always include functional & discretionary ligatures. For example, we condense the triple 'w' used in URLs by drawing only five 'v' instead of six. Droulers is a monospace, so this ligature spans two character spaces, but we also designed a vertical version that fits within a single space.

Found these two boxes at a flea market in my hometown, Tulle.
Inside: metal letter punches, used to imprint characters onto pieces. The seller told me they once belonged to someone working for Airbus in Toulouse.
A date is penciled in: 1964.
A name: Berton.
If anyone has more info, I’d love to hear!