Petrol lawn mower - two or four stroke?

[B3Svert]

Having moved into my house late last year, I only had to cut the lawn once before winter and the time has come (ok it's quite overdue now) to do it again. I used the lawn mower that I found in the garage left by the previous owner which had just enough petrol in it to do the job but now I need some more. Mower is quite an old looking Honda, is there a way of telling if it's two or four stroke? I don't want to damage it by putting oil in the mix if there's no need.

It's a Honda Easy Start HR194, done a google search and the Honda site states their current models are all 4-stroke but mine looks around 10 years older than them.

Is there a way to tell other than trial and error?

[B3Svert]

Thanks for that, there is a seperate oil tank so does that mean I do not have to do the mix myself? Assume it's mixed at the proper ratio by the mower itself in that case.
I guess I need some two-stroke oil, can I use normal 95 unleaded with it?
Sorry for all the dumb questions, first garden I've ever owned and want to make it as nice as possible