Was that canon, cannon feu ou is it my cœur, coeur pounding?

This Casablanca photo contains costume d'affaires and costume d’affaires. There might also be costume, costume de vêtements, robe costume, robe complète, frac, manteau de queue, queues, cravate blanche, cravate blanche et la queue, robe longue, tailcoat, tail coat, tails, cravate blanche et queues, habit, robe pleine, and queue de pie.