A unique feature on GM truck cabs became standard equipment between 1940 and 1946. Before and after this, truck cabs were very basic. As they were made for work, almost no extras were on them. The idea was to keep manufacturing cost very low. There was much competition with other makes trying to also keep their sale price as low as possible.
Therefore, it was a surprise in 1940 when GM trucks introduced an unusual feature on their commercial vehicle cabs. This was hammered paint plus a three piece set of narrow decorative horizontal chrome dash trim. It served no particular purpose but added to the appearance of the metal dash. This original trim was chrome on steel, so most show rust after 50 years.
Re-plating of the trim is difficult. It can not handle much polishing before rust pits will leave holes in the trim surface. It is now being reproduced in mirror finished stainless steel. It looks the same but is resistant to rust. Contact Jim Carter Classic Truck Parts or other full stocking truck dealers.