Vintage Vibroplex Horace G. Martin Double Lever Bug Telegraph Key.

There's no serial number.

Used as-found untested condition. Please enlarge the pictures from your desktop computer to see better every little detail.

Overall dimensions:

7 3/4" x 3 1/2" x 3"  (3 lb. 12.5 oz.)

Thank you for looking, and feel free to contact me with any questions.