Sabeltasche - opinion please

[marcinkappa]

Hello,

just got this straight from the barn. It is not my area of interest but I see this is some kind of Sabeltasche. It is very dirty but still in one piece.

The item is signed by the owner and placed in Mainz.
Please, let me know what unit could it be and how to place this item in time ???

[marcinkappa]

a

[marcinkappa]

b

[marcinkappa]

c

[marcinkappa]

d