Medal bar questions

[Noor]

Hello all,

I got a new medal bar this week and I have some questions.
It's a nice simple medal bar with EK2, Hindenburg cross with swords and Prussia 15 year Long Service cross.
My first question is, what does the stamp "TK" mean on the reverse? Is it some kind of makers mark?
Also I would like to ask about the LS award. Does it mean that the owner was probably NCO (or privates got them as well?) because he got 15 years cross? As far I can understand, the owner was probably on service already before WW1 few years? Is it right?

[Noor]

As you can see, the owner marked his awards . I think it give's more "soul" to this medal bar:

[Don D.]

TK and NTK must be his initials. He probably was an NCO. Remember that war time service counted as double time. That would be 10 years for ww1 service.

[Scott Powell]

nice NCO bar!

[McCulloh]

Nice piece-note the red hue of the backing and the catch.