For Sale TOC Seal Lock Acetylene O.K. 1900 Head Lamp. This is the large size. It is nickel platted. Length 5 inches, diameter 3 3/4 inches. It is missing the mounting bracket. It has a red and green jewels on the sides. It is not tested. It is marked on the back Seal Lock Company, Chicago, USA. Condition: It is all original. There is some wear to the nickel platting with some of the brass showing. There are dings on the rear of the lamp in the acetylene tank. Price $525 free shipping CONUS.