[7] A modified version was used by Imperial Japanese Navy with the designation Type 3 mortar as an anti-submarine weapon on escort ships beginning in 1943.

The improved version Brandt Mle 27/31 had become the basis for copies, near-copies and license-built mortars all over the world.

Other differences are the buttress-type threads on the traversing and elevating screws of the Japanese weapon, as well as the use of welding to fasten bipod legs to the clevis joint and grease fittings dissimilar to those used by the US model.

The collimator can be traversed in a full circle, and the azimuth scale is calibrated in 100-mil graduations in two sections of 3,200 mils each.

As in the case of elevation, a micrometer drum permits azimuth readings to be made to the nearest mil.

There is a throw-out lever for rapid traverse of the collimator, which may be placed at an angle of elevation and locked in position by a series of meshing notches.