What a great rare mechanical pencil from probably in 1952 when Purolator introduced their Micronic oil filter. I’m not sure if the top was filled with oil (probably) & the filter floated inside, it’s empty now though the filter moving. Some oxidation to the pocket clipped marked only Made in the USA. Measures 5 1/8" Vintage Circa 1952 Purolator Micronic Oil Filter Advertising Mechanical Pencil, Works But Needs Lead. As Found
