WW2 German images

Most likely something looted from Austrian or Czech armories pre war. Wooden spoke wheels make it unlikely to be looted from the French, but it could also be from Belgian or Dutch stocks.

It's definitely not Dutch. The Dutch had five different artillery guns in 1940. All made between 1878 and 1904.

The first two were "heavy" guns so thoroughly obsolete the Germans melted them down right away.
Stuk van 15 lang-staal
Stuk van 12 lang-staal

The lighter veld/field guns were slightly more modern and had received some upgrades post 1918. Most were used in France to equip the Atlantic Wall.
Stuk van 10 veld
Stuk van 7 veld
Stuk van 6 veld

The last artillery piece used by the Dutch army during WW2 was used during 1944-45. Called the "Stuk van 9 veld" it was the QF 25-pounder. It remained in use until 1985 with mobilization units after having been taken out of service in 1965 with standing field artillery units and replaced with the AMX-PRA 105mm self-propelled howitzer. In 1985 both field and heavy artillery units switched to the M-109 and later PzH 2000. The MLRS was also used from 1988 until 2004, mainly to have the capability of using tactical nuclear weapons. Honest John -> Lance -> MLRS.

After one of many overhauls of the fire support units of defence cuts after defence cuts the 120mm mortar now has the field artillery role and the PzH 2000 the heavy artillery job.

From some research it seems highly likely to be a captured Soviet M1937 152mm Howitzer.

Agreed mate this WW2 photo diary describes it as a "heavy Russian gun, trophy of the battle for the Volchov Pocket."