The 6-pounder anti-tank gun was developed and produced in Great Britain during World War II. The first 6-pdr anti-tank guns saw service with the British 8th Army in North Africa in the summer of 1942. They replaced the 2-pdr anti-tank gun by early and saw service with all British Commonwealth forces for the rest of World War II. When the 6-pounder arrived at the front, anti-tank gunners finally had something that could kill German tanks at a reasonable distance. The had an effective of 1500m against earlier German tanks such as the Stug III and Pzkpfw IV, it was outmatched by the armour of the heavier Tigers tanks where the penetration could only be achieved within 100m of the range.  

A 6-pounder anti-tank gun and its crew in action in the Western Desert, November 1942 [Via]

The 6-pounder first saw action in British service in May 1942 at Gazala in North Africa. It made an immediate impact as it was able to penetrate the armour of any German or Italian tank then in service. In a celebrated action, the 6-pounder guns of 2nd Rifle Brigade destroyed more than 30 enemy vehicle during the Battle of Alamein. However, the Germans began to field increasingly heavier tanks beginning in 1943, including the Tiger and the Panther. The standard 6-pounder ammunition was insufficient against the frontal armour of these new vehicles, though still effective when presented shots from other facings.

A British 6-pounder anti-tank gun in action in Tripolitania, January 1943 [Via]

It was the 6-pounder gun that accounted for the first Tigers disabled in North Africa. The situation was improved by the development of more sophisticated ammunition, particularly Armour-Piercing, Composite Rigid (APCR) and Armour-Piercing, Discarding Sabot (APDS) shot, which was available from 1944. The latter was particularly successful giving the gun the capability to knock out a Tiger I Panther tanks frontally, head on at 1,000 meters.

In the Royal Artillery regiments, the 6-pounders were joined by the 17-pounders starting in 1943, but in infantry units the gun remained the sole AT gun in service until 1951, when it was finally declared obsolete and replaced by the 17-pounder in the British Army of the Rhine (BAOR).

These original WWII dated 6 pounder anti-tank guns are un-restored but fairly complete and in good condition. There are two pieces available, and they can be supplied 'live' subject to production of a suitable F.A.C. or can be deactivated to current proof house specifications. They are sold for £14,250 each.

On July 12, 2014 one 6-Pounder Anti-Tank Gun Mk 4 Gun on Mk 1 Carriage, built in Australia in 1942, was auctioned by "Auctions America and sold for $57,500. This gun was an older restoration, its paint was in excellent condition, the gun traversed and elevated normally, although the tires required to be replaced. In general, this gun was in better conditions than the gun offered by Milweb today, but we can make ourselves an idea about which is its historic value.