Does anyone recognize this knot?

[jviss]

I like the halyard hitch knot for this use.

I recommend that a halyard hitch be seized, as above.

 

[Len Ingalls]

Part of a Dogshank knot? See also Catshank
The knot shown by OP is nothing more than a bowline with a long bitter end.The bitter end is stored by hitching it around the loop of the bowline-to keep the end from flapping in the breeze? This hitching has no effect on the bowline as far as I can see?

The dogshank is a more secure version of the sheepshank?

 

[rgranger]

Looks like a halyard hitch and a bowline.

Yup.... a halyard hitch with one extra loop.

 

[Will Gilmore]

Part of a Dogshank knot? See also Catshank
The knot shown by OP is nothing more than a bowline with a long bitter end.The bitter end is stored by hitching it around the loop of the bowline-to keep the end from flapping in the breeze? This hitching has no effect on the bowline as far as I can see?

The dogshank is a more secure version of the sheepshank?

I've only ever had two times where I found its use appropriate. There aren't many times when one wants to shorten a line in the middle and have the slack to do it too.

-Will