Vtg Keuffel & Esser Co. "Neptune" cased set drafting mechanical drawing tools

Staedtler Mars-Masterbow Mechanical Mathematical Precision Drawing Drafting Tool

VINTAGE '73 German Staedtler Mars Comfort 556 00 Precision Compass Drafting Tool

Staedtler Mars-Masterbow Mechanical Mathematical Precision Drawing Drafting Tool

VINTAGE Staedtler Mars Superbow Drafting Compass - Made in Germany - Precision Q

Staedtler Mars Comfort 551 Precision Compass Masterbow Drafting Drawing Tool

Drafting CompassStaedtler MarsMasterbow 551 63 WPGermany

Vtg Staedtler Mars Masterbow Drafting Set 55145A6 Germany