Longbranch No. 4 Mk. 1 * Magazine Markings

[jcmartin]

I am trying to research the different manufacturer's of followers used in Longbranch No. 4 magazines. I have what appear to be unused Longbranch spine marked magazines (still in the wrapping) with followers marked Circle B, UCF, and S. I have another with the Savage S within a square mark. Would appreciate any information on this thanks!

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