152 H 88 is the name of a series of modernized 152 mm towed heavy howitzers with 32 caliber barrels. The guns of the series share the same barrel as well as other similar qualities, but differ slightly in appearance, since they consist of three different, older (modernized) versions. The modernization was carried out by Vammas Oy from 1988 to mid-1990s. The modernization project consisted of numerous modifications to the guns, some of which had already undergone earlier smaller modifications. The most important change was the replacement of the original barrels by a Finnish-made 152 mm barrel. Also the gun carriages were subjected to various modifications. After the modernization, increased towing speeds were made possible. The breech mechanism is manually operated in all the guns. All the