Help required to ID makers Mark.....

[Missing Something]

Can anyone ID this mark on a 2" Mortar. Base is marked ML-2-IN. Mortar 8*
A.B.L. 51
SEM in circle
and a crown with letters....

 

[JP]

I think its a Belgian marking.

 

[eos]

Belgian for sure.

 

[Missing Something]

OK... but manufactured by WHO?

 

[JP]

I do not know the maker, I am going by the Crown proof mark on the right.

 

[j-man]

ABL - from a quick google search on Armee Belge:

"ABL is an acronym for the Belgian army; the "AB" of ABL stands for Armée Belge - the French words for "Belgian Army," while the "BL" stands for "Belgisch Leger" - the Flemish words for Belgian Army."

 

[j-man]

I suspect 51 would either be the year of manufacture or year of service entry. Any chance this is a Brit 2" SBML mortar sold or donated to Belgium after the war? Not sure what SEM is but likely something like Section d'equipments mortier or munitions. Possibly an ordnance acceptance mark?