If we look at the various examples referenced here, it is apparent that no two are exactly alike. The quality of workmanship varies widely, and is generally not of a high standard. Certainly not up to the quality of blades coming from Tjikeroeh and other centers in Western Java during the late 19th and early 20th C.
I think all of these are of Indonesian manufacture and it is unlikely that any European was involved in their production. I believe they were intended for sale to the local and overseas European market (i.e., Dutch colonials and homeland), and are not in any way linked to the VOC. The markings are designed, perhaps, to appeal to nostalgia in the intended market. As to when they were made, I would guess in the early 20th C around the same time the better quality European style knives and swords were being produced in blade centers of western Java.
Auctioneers' stories of these swords being supplied to sailors aboard VOC ships are highly unlikely to be correct.
