There are a number of ebay sellers who offer once German bayonets that were sold to the Turks and modified as purely German bayonets, which is completely misleading and incorrect. "Turked" German bayos are worth about a 1/4, and sometimes much less, than their original counterparts.

The most common Turked bayonets that you will find are the "ersatz" series of bayonets. These are generally all metal bayonets that were constructed during the beginning of WWI to meet supply demands. There are several points to know that will help you distunguish the real German ersatz from the Turked ones. First off, most Turked bayonets are shortened to a blade length of about 10 inches. This is easy to spot once you've seen enough German ersatz bayonets, and you can tell from the photos based on the blade fuller, which on the shortened turked bayos will run almost to the tip. Secondly, you will find sloppy numbers on the crossguards of many Turkish bayos. Sometimes, the turked ersatz bayos will have new crossguards added, but unless you have studied bayonets enough, this won't be the easiest thing to notice. The scabbards that come with the Turked german bayonets have ROUND frog studs. These are always 100% Turkish.

You will also find both the German S98 (quillback) and S98/05 (butcher blade) bayonets Turked as well. You can find these in both the plain blade and sawback variety. Regarding the 98/05s, the majority of the Turked examples you will find are from the maker Waffenfabrik Mauser and are dated W17, though you will also find some others. The Germans NEVER shortened the 98/05s! The Germans did shorten the S98s, but unless the example comes with a GERMAN scabbard (either a shortened leather scabbard with metal fittings or the metal replacement scabbards, both of which have German markings), the bayonet is Turkish. Another thing you will notice about Turked S98s and 98/05s is that they tend to be in poor condition. The grips usually have been worn smooth, which you would never find in the German army, as they would have been promptly replaced. The sawbacks on the Turked models tend to be worn down as well. You will also find sloppy numbers on the crossguards of these models as well.

KNOW the difference!! There are some sellers out there who just don't know enough, and they really thing the bayo they're selling is German, and there are other sellers who do know the difference, but are taking advantage of new collectors who haven't done enough research to know the difference. Ask any bayonet collector who has been around for a little while, and they will tell you that the above information is 100% correct.

I hope this helps! Please let me know if it does!