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Thx for the painting advice. So I wonder what the numbers on the cylinder are then. To me it looks like there’s a degree symbol after the 3 if that sheds any light on the query.
G'day all sand casting lovers
My reality is that these cylinder casting numbers are
factory in-house and probably relate to mould identification.

This would be important in tracing defective castings for
warranty purposes. Maybe Mould No 3 first used 1971?
Who knows...?

I do not feel they are meaningful to mower identification at all.

Cheers
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Jack