Coal Miners Cap,Wheat Light,MSHA,Koehler,Old,Great Shape

Coal Miners Cap,Wheat Light,MSHA,Koehler,Old,Great Shape. Wheat Electric Lamp ,Mfg by Koehler Mfg Co. Marlboro,Mass.USA. Complete Except for Battery I never new what kind of a battery,Approval 6D-30-46 cable in great shape ,lamp in great shape,cap in great shape , clip for lamp in great shape. I’ve had this for around 50years got it from an old man who worked in our Local mines at the time. An Explosion killed 13 men and closed the mines. Mine Number 21, I remember going to the Funeral Home. All miners were there, I already had the Lamp He wasn’t liked. I think he was a Safety Man
Additionally , this is vintage, not mint condition, I think it was in working condition, No. Guarantees, no corrosion, just in my basement, It’s time to let it go. The cap and leads are in nice shape. It appears to have a piece of tape on a lead. I don’t know why , I took several pictures. Thanks