Almost all the viking swords I saw in books or on the internet are either pattern welded or have some sort of inscription. Petersen type F, G and M are exceptions, but it's true for most others (especially the swords with fancy hilts).
Lots of reproductions however, have simple hilt elements and no pattern welding/inscription. Is this just to decrease cost?
Or are there any (original) simpler versions of, let's say Petersen type S hilts? Are there fancy hilts with a blade that isn't pattern welded or doesnt't have an inscription?

All the later Petersen type X swords, and early medieval "brazil nut" swords, I saw have, some sort of inscription. Does anyone know/have any pictures of type X/Brazil nut swords with NO inscripton?
Thanks!

The lack of inlay and/or pattern welding on reproductions of this period is one of the major faults with most modern repros IMO. It is almost certainly due to cost and difficulty. That said, I have included a couple of Pet type X without inlay from Geibig's book... There are also Brazil Nut examples without any inlay in the Geibig's book.

http://livinghistory.cz/~sidney/Zbrane/swords...at0057.jpg

http://livinghistory.cz/~sidney/Zbrane/swords...at0168.jpg

However, if you are trying to have a sword representative of the period, IMO it should have inlay (either on the blade and/or inlaid decoration on the hilt) or a pattern-welded blade as that is more common than a sword without any inlay. Though there are examples to be found without any, the norm is inlaid.

That's what I thought.
I found some without inlays too, but inlayed blades are more common, at least in books.
I plan on having a brazil nut type x made, probably with an Ingelrii inlay. I need to do more research though.

High quality blades with fancy decoration tend to get passed down to the next generation while typical working swords are more likely to be discarded in favour of the latest fashion. Just because we have a lot of inlaid swords today, doesn't mean that most of them were like this when they were in use.

Reading Ian Pierce's "Swords of the Viking Age" and Ewart Oakschott's "Archaeology of Weapons" it seems most Viking sword finds have highly decorated hilts and pommels, either inlay or the addition of decorative metals beaten onto bade metals, and/or the addition of other decorative materials. The finds where the base metals are no longer in evidence show the preparatory working of the base metal to accept the covering. Most reproductions do not have this feature, but some will sport a representation of the preparatory work as though it were the finished surface. The contributions of cost, ability, and required effort to this fact is self evident. However, some hilts with inlay can be found in some lower price point reproductions, but as is commonly true of these types of swords historical accuracy is sacrificed in many areas to bring a lower cost product to market. Better reproductions are available, usually more in the custom arena where cost and wait times are greater than the production repros. Pattern welded and inlay blades also seem to follow the same general availability/cost/quality scenario in the reproduction market.
Perhaps like many here I've had far more opportunity to learn by reading books and viewing the research of others than to actually see or handle period swords........