{"p":"","h":{"iv":"ROXSYW+cfvEbFHu5","at":"ocxplSQjdRC3tXEtB/9/wg=="}}

Thanks Paul! Mystery solved:
The center pin is the seal serial number, because the seal does not have any other part visible from the outside when the tube is sealed. The outer rim number is the tube number and the one between them is the ferrule serial number, as seen in in the images:

@PaulHammond51 @tom30519 mastodon.social/@sharponlooker

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Paul Hammond

@65dBnoise @tom30519
Your annotated images throws much light on what was previously a very confusing situation (for me) :)

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