Besides the surface rust, it sure looks like it had an easy life and that is definitely an older gearbox judging by the looks. I can't believe how straight the deck is, not even a circle imprint from the blades like most eventually get.
See what info you can get off it, might find literature for it on ebay or similar.
There was a post on here about Grease vs 80W-90WT oil in these, my old Rhino SE-6 actually called for 0 or 00 which is heavier than 80W-90, less viscous and almost like track roller lube which is a stringy tacky type lube, almost reminds me of chainsaw bar oil.
Someone made a point about grease that I thought was good, I would not use it, unless nothing else was available, fix the seal and used the appropriate lube, its designed for splash lube applications which is what the differential/gearbox is. One of the reasons I would prefer to use the heavier oils is for maintenance, mixing greases and oils, incompatible soap bases and whatever else, has the potential to make a mess, when I want to change the oil on mine, I flip it over, drain it, and refill with Lucas 80W-90 or whatever grade, (I forget at the moment) but is stays clean and does not leak, I'm sure the seal has plenty of miles on it too !
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