Unusual Bob Dawe pot

I recently bought this brown pot as it caught my eye and is very different to the other pieces of Bob Dawe which I own. It has 4 holes in the top and was described as a 'pebble pot.' I have no idea when it dates to or what it would be used for.

I’ve cropped the photo. Does it have Dawe’s Red Barn mark?

There was a brief fascination for naturalised pebble pots in the late 60's early 70's. Mary Rogers did them early on in her career, and I think a number of potters in what you might term the Wallwork/Rooke school (with which you could loosely associate Bob Dawe) played around with them a bit. But they did not seem to catch on in a big way.

Thanks for the info.