An interesting German (?) flute

Perhaps you can help identify the flute below, or at least suggest a country of origin.  There is some lettering visible on it, but not clear enough to make an identification.  There is however a maker's mark.  

Four 6-pointed stars appear on the upper body, two on the lower body and one on the foot, just below the Eb key plate.  As can be seen, stars may not be the best description.  Perhaps asterisks or snowflakes?  Note also the somewhat irregular spacing.

About the flute

The flute itself is ebony, with ivory mounts, brass tuning slide and nine silver keys.   

Note the G# key is mounted below the break between the left and right hand sections. 

Note also the additional key on the upper section, probably a D trill.  This key is strangely placed - equally inconvenient to thumb and first-finger, so perhaps intended to be operated by either?
Note also the c key is mounted on the same block as the Bb key, making for an unusual balance point.
Perhaps the most intriguing feature relates to how the leather pads are secured to the key-plates.  As you can see on the left, they are sewn!  Presumably fine adjustment of pad seating was achieved by bending the thin metal of the shaft.

The embouchure

The "TV-shaped" embouchure hole is an interesting and conspicuous feature.  It's about 9.55mm wide from left to right, narrowing to around 9 near the corners.  From front to back, it's about 9.2mm, narrowing to around 8.4mm near the corners.  The corners are rounded a little.

Left undercutting is about 1.1mm, right 2.1mm, front and back around 1 mm.  The walls are not quite straight, but suggest a primary and secondary taper, particularly on the sides.  The metal slide is cut well further back on all but the left (stopper) edge.


Finger holes

The finger holes are interesting too.  Undercutting is hardly the word - these holes have been undergouged!  The undercutting along the length of the flute is normal if extensive, but across the flute, they have been scooped out vigorously, leaving a concavity on each side.

Dimensions

These dimensions (in mm) may assist us to identify a match:

Head:
Length of head (including rings)
Protrusion of slide
Embouchure centre to lower end of head
Head bore
Outside diameter at the embouchure .

141
35.6
75
19.4
29.3

Barrel: 
Protrusion of slide
Length of barrel body

21.7
62.4

Upper body:
Upper tenon
Between tenons
Lower tenon
Bore at top
Bore at lower end
25.3
155.5
21.3
18
15
Diameter From top
Hole 1
Hole 2
Hole 3
6.4
6.5
5.7
99
135
170
Lower body 
Top to start of tenon
Lower tenon
Bore at bottom
137
17
12
Diameter From top
Hole 4
Hole 5
Hole 6
6.05
5.85
5.1
47.3
82.2
118.2
Foot 
Length
Bore at bottom
157
11.8

Tuning

As you can see, it's not currently playable, so tuning is a bit of a guess.  We can expect it to perform best somewhere around 425Hz.

If you can help with suggestions as to who the maker might be, or any similarities you've seen with other flutes, please contact me.

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