Just found this site, looking for any info on a knife I found while cleaning out a barn. Knife has a wooden handle with retractable steel blade marked Alex Coppel Solingen. Appears to be very old, some type of makers mark is visible on the opposite side of the blade from the name. Handle is unknown type wood, (bolster?) is brass. A steel side locking mechanism allows the blade to be locked at any of 5 lengths. Handle is 6" long, knife is 11" long when fully extended. Blade slides inside the handle. I am not a knife afficiando but this one caught my attention. Thanks. SPS