Looking at this old photo of Moro swords

[Pitt1999]

I am assuming that most of the denizens of this forum are familiar with this photo, which if I remember correctly is showing a number of captured Moro swords. When I first saw this photo a few things immediately jumped out at me. The first being the profusely curved sword at the top of the photo which stood out like a sore thumb. It reminded me of some Dayak swords which have a similar blade shape. The other things are these two very small barong, which seem to have blades of around half the length of the more numerous average sized barongs in this photo. Are barongs of this size this uncommon, the ratio of "normal" barongs to these small barongs makes it seem this way. Unless I am unaware of a thread floating around, I haven't seen a barong this small discussed on the forum before.