A group of 4 steel double-flagged railroad keys for Signal or Maintenance of Way. The first key is stamped Corbin Cabinet Lock Co New Britain Conn USA on the front with 111P stamped on the reverse side. The barrel opening of the key is slightly dented resulting in a non perfect circle. The second key is stamped Corbin on the front with P117 on the reverse. This key has a minorly flattened hilt. The third key is stamped 7 on the front with no reverse markings. The fourth key is stamped Bi-Metallic on the front with no reverse markings. Keys show standard signs of use with minor tarnish and pitting. See photos for best description.