body material for Pelikan 140

[bearhung]

I've just bought my first Pelikan, a vintage Pelikan 140, one with the classic green-striped body which I like very much. However, I'm not quite sure about what material does its body made of. While it looks like ordinary plastics (resin) to me, on some auction sites the sellers have described the material as cellulose.

1. May I know what material does the body of 140 really made of?

2. Is there any special care instruction for pens made of cellulose? Say can it be soaked in water when cleaning just like modern fountain pen?

Thanks.