Here's one of those things where the unknowledgeable Ebay seller lists the entire pipe as being by the maker's mark stamped on one of the chanters that's in the box with the pipes. Oftentimes the stamped chanter is a Practice Chanter which to us pipers is obviously not part of the pipes.

In this case it's a Pipe Chanter by Sinclair. The seller says the pipes themselves are unmarked but I wonder. Sellers often don't look in the Cord Guides where most modern pipes are stamped.

In any case the narrow catalin at the tops of the drone bells suggest Gillanders (Bob Gillanders/Gillanders & McLeod/McLeod Forfar) while the fat chunky projecting mounts are a tad like Grainger & Campbell. Either way clearly not a Sinclair set.

https://www.ebay.com/itm/31396034405...MAAOSwIMJiW1WY