I wouldn't go by the pink sheet symbol to get a true gage of the liquidity. I've purchased foreign stocks in the past (canadian) that had a Pink Sheet equivalent symbol and noticed some times when I purchased no volume showed for that symbol. I am not sure how they settle/work out the transaction with the major exchange the stock is listed on but the transaction executed without problems. I think Dew (perhaps someone else) pointed out the best way is to translate the quote of its major exchange in US dollars and place a limit. I think MOR.DE has the most volume not that it has tons of volume but certainly getting a couple thousand shares a day shouldn't move the price. Other symbols I've found for it are below (Yahoo style)
Market Data 
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