Hello Ben,
yes, the part down from the sampir/warangka or wrongko is called by javanese keris gandar; by keris from Bali penyejer. The pendok from your keris isn't a balinese one so my assumption that it was placed to cover a demaged gandar/penyejer. A gandar isn't never original cut in down or open.
Regards,
Detlef
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