It's a Rocna 20, the same size we have on our boat (photo). Expand Eric's photo and you can read the label. And that's not the trip hole. The two holes in the shank are the attach points for a tandem anchor. The attach point for a trip line on a Rocna is the small hole you can see in the top of the fluke for a shackle. We leave a shackle per mantle in ours as you can see in the photo.
Tandem anchors are popular with a lot of boaters in the open, exposed anchorages common in the southwestern Pacific which is where Peter Smith did/does a lot of his boating. So he wanted to incorporate good attach points for a tandem anchor in his design, hence the two holes in the shank. The instructions that came with our Rocna illustrate how to use them.
An interesting thing in Eric's photo is that this fellow is using a swivel and, like a lot of boaters, he's installed it backwards thus leaving himself exposed to snapping the swivel pin if the boat gets off to the side of the anchor a bit and is pulling hard. With the swivel installed the way it is in the photo it can only pivot up and down in line with the shank. So any kind of sideways load will try to bend the swivel pin, which is not made to resist this kind of load. if the load gets high enough, the pin will simply snap and the boat will no longer be attached to the anchor.
When we installed a swivel on our old Bruce I put it on exactly the same way. Fortunately I read Earl Hinz's book soon after and turned it around properly and attached the swivel to the shank with a shackle so the swivel would always be in line with the rode no matter where the boat was in relation to the anchor.
However we soon eliminated the swivel altogether as it had no value to our operation and I believe the fewer components in an anchor setup the better.