See picture nine and 10 hairline crack This vintage Kopp Glass railroad lens is a unique addition to any collection. Measuring 4.75 inches, it features a charming design of birds and flowers on one side and a hairline crack on the other. Made in the United States, this piece is a true gem for collectors of transportation and railroad memorabilia. The brand Kopp Glass is known for their quality and this lens is no exception. It would make a great decorative item for any home or office and is sure to be a conversation starter.