I've probably posted them in the past but in addition to what the guys have already said here are scans from a 1941 DJ leader booklet showing both the Bann/Jungbann and Gefolgschaft/Fähnlein
standard bearer patches for general orientation on what an original should looks like. As Wim says, the Bann/Jungbann patches had a particular font which can again be seen on the scans. I would personally avoid all of the "250" patches for the reasons given by Darin and Wim previously.
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Here's one I used to own which again shows that oval "0":
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More patches:
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