Congratulations, you have found the home of possibly the most sought after tool for many a year.  A true phoenix rising from the ashes.
In conjunction with our buddy Niall, we are pleased to offer this rare, 12" larger sized Premium Grade Adjustable Quick Square.
Identical to the obsolete Stanley 46-052 (except with a black finish) which went out of production many years ago but is still in huge demand.

Premium Adjustable Quick Square.
Large 30cm (11.3/4") length side offering a 25cm (10") angular facility.
Heavy-duty aluminum construction for durability.
Black body with white graduations provides maximum readability in various light conditions.
Features Common, Jack and Hip, and Valley scales for various applications.
Multipurpose, adjustable design can be used as a saw guide, bevel or protractor.
Adjustable arm fitted.
Guidance book also included !!