Rogue One: Rebel Pocket Pen Prop

Code cylinders come in many forms. Depends on which ones you are looking for. Many use old style chalk holders. Some are machined aluminum. Some are dosimeters.

The ones you stated look machined.
 
Just wanted to add:

There are three styles of dosimeters used in ANH. I think they used modern replicas for R1. It APPEARS to me that they use both the blue cap style, and plain top style. But the plain tops may just be an illusion from being a filmed at an angle where the blue top cannot be seen.

The Imperial officers carry them, of course, but Jyn carries one, and Cassian carries three on his parka.
 
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