We dont see many details, first question is LW frog? then under this there is a other stamp which is not readable, is there LBA stamp anywhere?
The first could be St, Sl, Si but i could not confirm, the last one could be Kp. - S. u. Wach Kompanie could be real.
I think it is two units. The Headquarters and headquarters company (HHC) which is considered as one unit. Handles training, supplies, etc. and the Military Pay Operations (MPO) which over sees pay and also supports the strategic readiness of the Army through support of mobilization and demobilization. I am sure if I am wrong someone will correct.In shortages of Wehrmacht :
Stawiko : Stab und Wirtschafts-Kompanie
Stab is Headquarter of the unit, the Wirtschaft is a supllement and economical unit for complete unit, payments, sources ,food, distribution of material and others.
In Czecho_Slovakia it was called Rota Tyloveho Zabezpečeni.
I dont known how is called in US army similar unit.