English, early 20th century, unsigned, the large secondary coil with celluloid covering between vulcanite supports with vulcanite spark barrier in the centre, with large adjustable contact breaker, Ruhmkorff polarity switch to the front, two tall insulating rods supporting the adjustable spark gap, all on a polished mahogany baseboard in the original substantial pine case with two cast iron carry handles, coil 50cm wide, case 57cm wide