I cannot speak with any authority in respect of keris from areas other than Jawa, Bali, & Madura, but in these places the normal way in which all luk were and are put into a keris blade was and is by forging.
Some blades that have undergone revision, usually very inferior blades that have been reshaped for the souvenir market, may have had luk cut into them.
It is not at all unusual to find a blade, be it a keris blade or otherwise, that is comprised of several layers of material, in older Javanese blades, especially those blades that are classifiable as Mataram from around the Sultan Agung era, it is quite common to find a construction where the steel core has been inlet around the blade edges, the body of the blade will appear as relatively loosely grained iron, not dissimilar to common wrought iron, and the overlaying material will be tight, well compacted iron, sometimes with contrasting pamor, sometimes a simple sanak. In keris made specifically for combat from this era, sanak is the more common material.
I have put this blade under discussion into correct orientation for viewing, and I can see no evidence of reshaping. Proportions are well within accepted parameters for a relatively recent blade --- "relatively recent" = post 1850 in this context.
I am unwilling to state probable geographic point of origin from the photographs, but garap would not be out of place in East Jawa.
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