search maintance guidline for old NOLEEN NR-1 rearshock

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i've got an older shock of Noleen, i think about 6 jears old but less used.
(about ~165mm lengh)
it lost his oil an pressure.
unfortunately is it ineffficient to ship the shock to USA because of postage and there is no one near to me which could help.
so i think i will try to refill it by myself, but i dont know the type of oil and viscosity and the pressure.
is there any one who got an maintance guidline for the old shock ?
or any technical data for it ?

i think it is a NR-1 see .jpg