Shetland floor polisher age question

[2011hoover700]

Hi I saw this on eBay and I'm wondering how old this unit of Shetland floor polisher is.
My grandparents had a brownish version of the exact same machine so I thought I'd ask
Thanks.

https://www.ebay.com/itm/Vtg-Shetla...b55a3a724b9686dc7f7c42e1dfc5&pid=100675&rk=1&

 

[lesinutah]

Guessing

It's mid 60s early 70s.