BOLT CHECK!

Recently came into an unidentified bolt and carrier through a trade.
The bolt is marked "E".
Anyone know the maker??
I know the most common markings, but this one eludes me.
Seen many references to "F" marked FSBs but that's it.
Any and all info is appreciated. Thanks!

Recently came into an unidentified bolt and carrier through a trade.
The bolt is marked "E".
Anyone know the maker??

I know the most common markings, but this one eludes me.
Seen many references to "F" marked FSBs but that's it.
Any and all info is appreciated. Thanks!
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