Yeah its the S tank (the picture name hehe), well i could defenetly give you swedish text but i guss thats not that wanted?
"Stridsvagn 103, commonly known as S-tank, was developed in the late 1950s by Bofors to meet requirements of the Swedish Army. Strv 103 is unique in that the 105 mm gunis fixed in the glacis plate and is aimed in traverse by pivoting the vehicle on its tracks, and in elevation by adjusting the hydropneumatic suspension from -10° to +12°, with driver acting as gunner. It is armed with a automatic loaded 105 mm gun firing anti-tank rounds (APFS/-DS), HE (high explosives) and smoke rounds, empty cartridges cases being autmomatically ejected from the rear. It has three 7.62 mm machine guns (two parallell with the main gun, and one on the commander's cupola), Model 58. Normal range for firing the gun is up to 2,000 m and rate of fire is 10 rounds/min.
Strv 103 weighs 39.7 tonnes and has a crew of three: commander, driver, also operating as gunner, and the radio operator, also function as driver when the tank is going in reverse. Maximum road speed is 50 kph. On-road and off road ranges are 390 and 150 km, respectively.
Strv 103 is currently equipped with a float-skirt and can be made ready for fording within 30 minutes. The driver stands on a special platform and steers with reins. After fording, the vehicle can be made ready for action again within 10 minutes.
All Strv 103s are fitted with a dozer blade, and can be fitted with mineclearing rollers at the front of the hull.
Stridsvagn 103C has recently been phased out and replaced by Stridsvagn 121 and 122 (Leopard 2)."
Found this from the link you got the picture at