Thanks for the pictures of the inside of your cap. First let me say I wouldn't take that cap back for a refund, regardless it's a nice and rare cap.
Nothing posted has changed my mind or my opinion. Since I'm now alone in my belief of only the bright purple being used by the clergy of all faiths including Rabbis who oddly enough also wore the distinct purple cross on the armband.
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I was hoping for some clarification or documentation on the type of cross on your cap, just for my own records.
First you stated that the white enameled cross was the "early war" version and your example was the of a later variety.
Now it's being described as the " Protestant cross" and sadly that's also just not true based on what I've seen over the years.
The way to distinguish between the Protestant and Catholic Clergy of the period is by looking at the type of Cross being worn around their neck. Not sure if you have experience with the differences between the denominations but Catholics venerate the Cross with the figure of christ on it and Lutherans do not. The cross in Lutheran Churches for the most part has no Christ on it unless it was an older former Catholic church that was spared being destroyed during the reformation.
Anyway, I don't want to get sidetracked into a religious discussion, but I've spent countless hours in both types of houses of worship starting before I could even walk or talk.

. Maybe that's why I'm so insistant about that distinct bright purple color used only by clergy back then and even to this day. It's more than just a just a piping color it has specific meaning and significance dating back to the Crucifixion itself, I could go on and on but will spare everyone.
Anyway, here are some images of Protestant Clergy during the war wearing the white Enameled Cross. (Thanks, for the photo links)
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On left notice the cross differences between Catholic on the right and Protestant left and of course star of David in the center being worn by the Rabbi. Photo also shows both the small and large versions on the enameled cross Catholic is wearing the small enameled cross.
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I'm not trying to say anything negative about your cap, I like it, but when I have questions, I really like to have answers that can be documented and proven beyond doubt.
Since the story about the cross has changed again and the newest explanation also just isn't factual, I'm sure you can understand my hesitation to just except that type of cross into my records going forward not that I wouldn't love to.
This is a subject that is really dear to me and of great interest. I've been looking through hundreds of items in my collection to hopefully be able to photo match this type of cross but sadly havent been able to do so.
I'm not saying that I'm an expert on anything, but I've been really interested in the subject for a very long time and just want to get it right.
Someone also ask, "Was it personal preference to wear either the field cap or the M1913 hat? (Slouch hat).
That is a great question I had initially thought that the Slouch hat was worn only by Protestant Clergy, but I have since found several photos of Catholic Priest wearing them as well.
I have no documentation on the rules that address this specific issue, but you have to go with what you have so photos have convinced me it could be worn by both Faiths. I also thought years ago that maybe the slouch hat was worn depending on the location in the field of operations but that also hasn't held up over the years having seen them being worn in Europe.
Sorry for the long post, I'm certainly not trying to argue or disagree with anyone and since I'm all alone with my position it's not a good place to be.

Maybe I should say nice cap

and be quiet.
Also, I'm aways actively looking for items related to the Clergy of all faiths serving in Germany or Austria during WWI if anyone would have anything that they would like to move on to a good home I'm very interested. Who knows you may have something that doesn't fit with your main collecting interest just collecting dust.
MFG John Josef