3./JR436 means he served in the 3rd Company (3.Kompanie) of Infantry Regiment (Infanterie-Regiment) 436 which belonged to 132 Infanterie-Division.
The signature is that of Rudolf Sintzenich but a better image will determine whether it is hand signed or a stamped version of his signature. Based on that image I'd say it is the stamped/facsimile version of his signature.
EDIT: Having compared it to a facsimile example I have in my collection I am 99% certain that it is not hand signed.
it looks a good one.Marc.
Hi Hucks, sorry for the delay, little health problem. Thank you for all information.
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Hello Marc. Thank you very much