Hello Paul,

I would really like to see those engine numbers.
The decal says 5h.p. - meaning this engine must be a 13 series Briggs.
[the numbers must begin with 13]

I would be amazed if these were imported in the early 1960s!
Here is a YouTube video of a 4h.p. that looks similar:-

[video]
[/video]

All very flighty.
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JACK