I THINK THIS IS IT! An Akubra Pastoralist style block. Now I have had problems with the line circling the Raiders crown. It seems to be low in back high in front, and the transition midway looks fuzzy and uneven. Look how low the line is here and how it fades away.
Look at the ribbon. If that is 1 1/2 inches, imagine a second ribbon above it would add up to 3 inches. The line is about 1/3 inch above that at 3 and 1/3 inches. The sides of the Pastoralist is advertised as 83mm, which is just about 3 and 1/3 inches. ....Now, the line is also seen higher, entering the back upper corner of the front dents.
...and produces a ridge across the very top of the front dent. ( That image can bee seen about 5 replies later in this post) .........SO, here's my hat shaped Pastoralist style, with 3 1/3 inch sides.
When it's popped up, there are two lines circleing the crown.
The line in back, the lower line, is the correct height
and the upper line enters the front dents where it should!
. In my last post I pointed out these bumps on the sides of the Raiders grey
Here are the same bumps on my hat produced by the lower line
The Akubra Pastoralist may not be the exact same hat used in Raiders, besides it's probably too thick a felt, - but I really think this was the style.
I am afraid stress lines in the felt has multiple explanations. All that I see is a stress line, nothing more. But, I am not saying that someone, the costumer, or even Ford may have punched the hat down to age it, and make it look worn and created a stress mark in the process. When one takes the written account of the HJ in consideration, the telescope crown is still a stretch. But, it is fun to think about it. I personally would need an official word to convince me as the other explanations are more plausible. But, that is just me. 
. The dome is a little flatter and the tucked in gap looks tighter. Who knows what this hat looked like 25 years ago. Maybe it had less taper. It's only currently available in Imperial felt which is thick. My squatter had the nice thin Superfine felt. I'll be looking everywhere for this style hat, but I'm not sure I'll order the current Pastoralist. But I'll probably have somethig on order or in my hands within the next two or three weeks. Here's another one. My mouthis watering! This one doesn' t look very tapered. 
Brim width on these is 2.88". That's a pretty tasty number.
..........Here's that scene from the temple. Click the link and note the circular crease that goes straight across the bash, over the humps, goes into the shadow on the near side, then re-emerges and heads for the corner of the front dent. 
There's really very little going on in the Raiders top bash. The shadow in this pic indicates the most noticeable landmark.
Since this felt gets pinched outward, when the front bashes get pushed in, it tends to erese these lines. (I pinched 'em fresh for this shot.) Still, there might be evidence in the Raiders hat. Some of you won't see anything, but I think I see the same line, 
