Mont. Code § 81-20-206
It is unlawful for a person to sell, offer, or expose for sale at wholesale or retail any eggs for human consumption without notifying the person purchasing or intending to purchase the eggs of the exact grade or quality and size or weight of the eggs, according to the standards prescribed by the department of livestock, by stamping or printing on the container of the eggs the grade or quality and size or weight. If the eggs are offered for sale in bulk, a placard or sign printed in letters 2 inches high must be displayed in a conspicuous place at the point where the eggs are offered or exposed for sale giving the grade, quality, size, weight, and date of grading. This part does not affect the sale of eggs by a producer when the consumer purchases the eggs at the place of production or at a farmer's market as defined in 50-50-102.
§ 81-20-206, MCA