This postcard of the River Forth and Stirling Castle has a border in the Macpherson red tartan. It is not dated.
It was seen on Ebay: https://www.https://www.ebay.co.uk/itm/256971288961.co.uk/itm/197597060446. Photo credit The Hoarders. There is no seller’s description, though the title labels it as Macpherson.
Threads of Belonging 