Picked up this Victa, Excellent base and pretty good overall, would like your thoughts on model / age. I'm presuming it's an earlier model having an impulse starter, metal fuel tank, metal cowling and brass fuel tap. Engine number is 368012601. The base has an opening under the engine as per picture, not sure what the purpose is and looks an overkill for a fuel run off from the carby after priming. I have another couple of mowers with a very similar bases and colour but they are all different.