I agree with you Cybber jJack it being early to mid 1960s . I have started painting it and thought I'd take off the side cover (after reading other posts about the modell 33 having chains or belts ). Mine has 2 chains and a belt that is on its last legs!!!. Just as well I checked it. Looks like I will be sourcing a new belt for it. Here are some more pictures. Whilst the cover is off should I put grease on the chains ?

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Yesterday is history
Tommorrow is a mystery
Today is a gift
That is why it is called the present.