A tidy No 138 A adjustable steel square by The LUFKIN RULE CO, USA.

Described as a Tool and Die Makers square by LUFKIN.

Marked 'THE LUFKIN RULE CO SAGINAW MICH MADE IN USA NO 138' on the stock.

2¹/₂ inch steel blade divided into 32nds and 64ths.

The larger thumb screw secures the blade whilst the smaller can be used to set the blade at an angle.

A few minor surface spots, please see images.

All parts move freely and tighten securely.

In its original slide top wooden box with trade label.