Jean, what you are talking about here is the difference between eras, the effect of time, and differences in post production processing. It is simply a matter of preferences.
In very simple terms, we cannot have a blade that was made only 30 or 40 years ago, or even within the last 100 years or so, that looks like a blade that was made 150 to 200 years ago. It was be very nice if we could get newly made blades that looked like 19th century Surakarta or late Mataram, but regrettably we cannot. The reason being, that the current local Indonesian buyers seem to prefer blades that look like Bill's keris, rather than ones with a Bali style finish --- and it is the Bali style finish that is required in the beginning in order to have that flat mature surface a couple of hundred years down the track.
The effect in that 5th pic of Bill's is the result of the deep etching process that is required by local Indonesian buyers of these keris. The method of construction of Bill's blade and a late 19th century Surakarta blade is the same, the pamor is not "deeply embedded", nor is there any "mixing into the blade core", the older blades have a less deeply etched surface, and there is a degree of mechanical reduction caused by wear. That is the only difference.
In a blade that has been made using the reverse V construction, what we effectively have is an inlaid edge, and this permits less topographic relief in a blade that has a pure pamor body, but a body such as this is rare, normally there is a very thin layer of pamor over plain iron. It is unusual to find this reverse V construction in blades later than about 1800, and they are pretty scarce.
However, it is possible to get older blades that have the superb pamors of the current era, along with the crisp garap of keris made during this revival era. The problem is that to even get one of these blades offered to you, you need the right connections, and then to actually obtain something, like, say, a Jayasukadgo, you need very deep pockets indeed.
It does help to bring us back to reality if we can examine closely the pre-17th century keris held in some of the old European museum collections. Most of these keris that I have examined were new or close to it when they were collected, and if they were to be stripped of their dress, and laid side by side with an equal number of revival era blades it would be a very perceptive man indeed who could separate the new from the old.
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