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Is there any way of knowing if its original at all? The base plate has a badge saying mower number 13313.
G'day Phil and Mod BB

With takeovers, it is common for company records to be lost.

I would think most early records were not transferred when Electrolux took over
the original SB company in 1970.

If anyone can give you a good assessment it will be Mod BB.
He has asked for images because there are specific identifiers that
may match your engine to the chassis.

https://www.outdoorking-forum.com.au/forum/u...mestic-product-line-c1968.html#Post58161

Hope this helps
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Jack