Tower Double Lock Handcuffs with Key

I recently found what I believe to be a pair of Tower Double Lock Handcuffs with original key. I may be wrong about them being Tower but after doing some research I think they might be. Im hoping somebody will know if in fact they are Tower and how much they might be valued at. I am attaching a picture so you can get a visual idea of what they look like. Any help or advice would be greatly appreciated. THANKS!