Used on literally hundreds of Martin guitars of that era.

As used on literally hundreds of Martin guitars of that era.

Components of 1950s-60s American-made Grover Imperial tuning machines.

Full-size six-on-a-side set, clipped.

American made, 6-on-a-side.

Used on literally hundreds of Martin guitars of that era.

As used on literally hundreds of Martin guitars of that era.

Components of 1950s-60s American-made Grover Imperial tuning machines.

Full-size six-on-a-side set, clipped.

American made, 6-on-a-side.