Blaisdell was better known for making paper-wrapped china marking pencils, but the company, run by another member of the Berolzheimer family of Eagle fame, also made some mechanical pencils, including clutch pencils such as the top two examples (which is why they are found with Eagle patented clips), and screw-drive mechanical pencils such as the others shown. If the trim was a little nicer, these would truly be memorable.
Clutch pencils shown use .080" leads. The mechanical pencils accept standard .046" leads.