Hi. I hope you can help. I recently purchased an old wooden doll trunk and one of the travel stickers is: Symbol of Superior Service - Frisco Lines - St. Louis-San Francisco RY... It's brown and white and has the "raccoon" outline in the middle of the sticker...Do you have any idea as to what date this could be from? The trunk is very worn, wooden and several stickers - but the Frisco one stands out! Thank you for any help you can share!