For further information on confirming the engine is not a Rudge Python, it was not until 1930 that Rudge decided to sell Python engines and gearboxes to other manufacturers. This was due to falling sales of their own bikes.
Therefore all Python engines will all have round flange barrels and splayed exhaust ports, but some will be forward magneto, whilst others, like Vincent, will be rear magneto.
Therefore all Python engines will all have round flange barrels and splayed exhaust ports, but some will be forward magneto, whilst others, like Vincent, will be rear magneto.