Thilo, most keris do not remain untouched from the time they are born until the time they die.
The gonjo may be changed several times, if it is an old and honoured family keris, the gonjo may be removed and incorporated into a new keris,or the original gonjo may be removed and replaced with a plain iron one that has kinatah work added. Many old keris that date from prior to the time of Sultan Agung had their gonjo removed and replaced with black iron upon the order of Sultan Agung.
Part of the normal maintenance of a keris is that the edges of the blade are cleaned up to remove fraying.
And as already pointed out, the pesi is often shortened, and occasionally lengthened, to accommodate the desired hilt.
Yes, they have sometimes been altered to make them more attractive for sale. The usual alterations of this nature are to put waves into a straight keris, and to create a surface manipulated pamor like udan mas or banyu tetes on a heavy bodied old keris --- mostly the big heavy old Tuban keris are used for this. It is sometimes very difficult to know if a keris has been altered when looking at photos, but for anybody with just a little bit of knowledge and experience, it is very easy to detect an altered blade once it is in the hand.
From what I believe I can see in the photos of your keris, I think it may need a fairly long time in the pineapple juice. It requires daily brushing, rinsing, cleaning whilst it is being given the pine juice treatment, the little hard bits of rust need to be picked off with a sharp tool.
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