WWI? uniform - help needed

Could anyone please help in identifying a native country of the person shown in this picture? Five vertical bars on his stand-up collar are quite distinctive but so far I wasn’t able to find where this type of uniform was used.
This miniature portrait was found inside a gold locket and is inscribed “K.G .Horn, Stockholm, 1912” on the back.
Attachment 284027


Click to enlarge the picture


 

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