Keuffel and Esser Favorite Slide Rule, K & E 1950s Model N4058W Quincy_MA_gift The pin is made of

The pin is made of a darker metal

The K&G Luneville ceramic plate

antique souvenir pin cushion by Jennings Brothers

It probably helped the divers stay under the water

Keuffel and Esser Favorite Slide Rule, K & E 1950s Model N4058W Quincy_MA_gift The pin is made ofThis is a vintage Keuffel and Esser Beginner's Slide Rule, model 4058W. Manufactured from 1950's, the 10" Mannheim type slide rule was constructed on a wood frame with a celluloid overlay laminated ruled surface with a plastic curser. The rule is in vintage condition with edge wear and finish wear. The cursor is still clear with minimal scratches. Include case which is worn and torn, as found, doesn't fully fit the ruler, likely not original. I'll