Toothed mobile part for play take-up in a gear, particularly in horology

Toothed mobile part for play take-up in a gear, comprising:

• first teeth that are fixed and entirely rigid and that have first and second flanks that are opposite each other;
• and
• second teeth each comprising a spring blade intercalated between two adjacent ones of said first teeth and comprising a gear flank directly facing the second flank of a first one of said two adjacent first teeth,
• wherein for each said spring blade a distance measured on a pitch circle of the toothed mobile part, between the gear flank of the spring blade and the first flank of said first one of said two adjacent said first teeth is smaller than a distance measured on the pitch circle of the toothed mobile part between the gear flank and the first flank of a second one of said two adjacent first teeth and wherein each said spring blade is narrower than each of said first teeth as measured on the pitch circle.