A fine genuine vintage Master Lock Co. flat brass pin tumbler key. , It measures 1 5/8'' x over 3/4''. , In beautiful condition with nice rich patina.
Vintage Brass Key, Master Lock Co., Vintage Pin Tumbler Key, Grip Tumbler Key, Vintage Steampunk Key, Key Pendant
How does a Pin Tumbler Lock work?
Locksmith Terminology: Pin Tumbler Cylinders – Locksmith Reference
1-3/4in (44mm) Solid Steel BumpStop® Rekeyable Pin Tumbler
How a Tumbler Lock Works – SubtleDigs
File:Pin tumbler lock-all.JPG - Wikimedia Commons
1961 - Pin tumbler cylinder key system Art Board Print for Sale
28.5mm RPT Pick Resistant Lock 5263
Locksmith Terminology: Pin Tumbler Cylinders – Locksmith Reference