The Beck Distribution Corp was a pioneer in motorcycle distributing sourcing OEM (original equipment manufacturer) and aftermarket parts and accessories for foreign bikes to suit American rider’s tastes. The company dates all the way back to the early 1900’s. I would estimate the helmet seen here is from the early-mid 1960s, but have yet to track down an exact date or model number. Vintage American Motorcyclist Magazines currently on Google Books gives hints to the popularity of this three-quarter style helmet and the Beck Corp itself during those early 60s. In 1969 Beck Distribution Corp merged with Arnley Brake Shoe Company and the name and logo were changed to reflect that. So if anything I can say this helmet is at least pre 1969.
This is one cool old Bell R-T helmet with a unique paint job. The Yellow and black appear to be part of a customization. The white around the perimeter and down the center was most likely the original color. The black striping is actually a decal of sorts and not paint. The color scheme and layout hearken the Yamaha YZ of that period and my explain why this particular helmet has extra snap heads have been added around the jaw area, perhaps for a face mask?
Sticker size 7 1/8 or 57cm in place as well as SHCA approval. Chin strap stamped BELL R-T 10-76.