GMT 1675, 57XXXXX, circa 1978, Mark 5, and Mark 5a

[springer]

GMT 1675, 57XXXXX, circa 1978, Mark V with original insert. I've also included photos of the Mark 5 and the Mark 5a together for
comparison purposes. There are subtle differences - to include the coronets and some of the spacing between the letters on the dials. Both the Mark 5 and Mark 5a are late 1970s dial. The Mark 5 is a Beyeler dial while the Mark 5a is a Lemrich dial.