countax hydrostaic oil reservoir?

have a Countax mower 20/50.



Serial number on chassis is 90210 2B767 0037 A



Not sure how old it is. Can you tell me ?



I just want to make sure I am topping up the hydrostatic transmission oil reservoir correctly but in the manual I have

The pictures etc it shows do not look the same as my vehicle



I have located what appears to be the reservoir however I cant see any marks on it as to how high it should be filled. There is no visable

Oil in it.!!



Can you advise me or suggest a contact for someone who can.



Many thanks