My mother won this Solar watch back in the 50's for achievment in 4H. No serial numbers visible. Silver back. I saw online this brand was sold by Eatons Canada. She later went into nursing and needed a watch with a seconds hand. Her brother at the time was stationed in Germany with the Canadian Military. He bought this Kiefer ladies watch for her. The back of the Kiefer is marked. Any information on either the Solar or Kiefer brand of wristwatches would be appreciated. Cheers.