Rick, at the moment I am working under moderate difficulty and on a public computer, so my explanation will be very brief and with no detail.
There is a method of blade construction that results in the base area of the blade being solid pamor, so it is possible to carve the sogokan and blumbangan quite deep. It was used with some better quality blades and the examples I have seen have been Mataram.
When I get home I can post a pic from a text on mpu work that will demonstrate this clearly.
If i look at the pics of this blade under discussion, it appears that there is in fact a slorok, but that slorok provides an edge that falls short of complete length of the blade. I feel it might be an older blade that has been tidied up a bit.
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