That doesn't necessarily mean it's the same oil.Alans was for export to a colder climate.Which is most likely why the decal was different,the oil would have to be a different viscosity to here.I'm certainly not sold on that's it's the correct oil.I have plenty and still have plenty of VC-Auto Drives and not one has got that sort of oil on there dacals.So I'm not sold and won't be putting engine oil in any of mine without further research.So really that doesn't prove it is Victa 25cc oil is.SAE 10 is just engine oil I'm sure here in Australia the oil would need to be thicker than engine oil.We get a lot hotter here then the UK.
Blumbly, I could be wrong but the way I read the label on your mower is "Use only 25cc of Victa gearbox oil part no 27-050" I believe the "25cc" part is the measure (cubic centilitres) which is equivalent to 25 ml?