original Japanese water bottle?

[gabe]

Helo!
Please tell me what is your oppinion about this Japanese water bottle? Is it an original ww2 item?

Pictures:
http://postimg.org/image/fhm6tcobf/
http://postimg.org/image/4b37ig4b7/
http://postimg.org/image/ltkimdekj/

Thank you in advance!
Gábor

[gunto]

Its ww2