Albert Einstein's pocket watch is to auction at Christie's.

The lot has a ?�15,000-20,000 ($19,935-26,580) estimate ahead of its sale in London on July 13 and is offered alongside Einstein's leather jacket.

This is the last Einstein watch left on the market

Einstein acquired the watch around 1900, the year he graduated from Zurich Polytechnic.

A year later he published his first scientific paper - a work on intermolecular forces he went on to disprove.

This was an important time in the great physicist's life.

In 1905, the year known as his "annus mirabilis", he would publish a run of four ground-breaking papers that rocked the foundations of science to their core.

We would posit that the watch will comfortably surpass its high estimate.

A Longines watch presented to Einstein by Rabbi Edgar Magnin achieved $596,000 against a valuation of $35,000 in 2008, an increase of 1,602%.

Einstein's only other known watch is housed in the permanent collection of the History Museum in Berne, Switzerland.

This makes the present lot the only Einstein watch on the market. It also has cast iron provenance, having been gifted to the consignor by Einstein himself.

Add to this mix the significance of time in his work on relativity and you have a highly desirable piece of memorabilia that could easily surpass $500,000.

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