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wt1 Thank you for the link but admittedly I don't really understand what it's saying. Can you dummy it down for me please?
I'm not sure how to explain it any clearer than shown in the link, but to summarize:
1. The link provides confirmation that Meter No. 90122 was assigned to the CONTINENTAL ILLINOIS NATIONAL BANK AND TRUST COMPANY OF CHICAGO. (That alone is crucial information that you just can't get anywhere.)
2. The link provides confirmation that the Registered Mail imprint on your label was only used in label form, in other words, no imprints directly onto covers exist.
3. The link provides confirmation that the user of that Registered Mail label had to put the "Registered Mail" portion of the label on the face of the cover and the postage paid indicia was folded over and adhered to the back of the cover. An unusual usage, but apparently required due to the "Registered Mail" status of the cover. (This is further evidenced by the scan of you example of that meter, showing the same fold-over.)
4. The link provides confirmation that the post office had to use a postmark (more likely a roller-type cancellation device) on the rear of the cover to show the payment of proper postage. (Remember, it is quite rare to see a postmark of any kind on a meter label, but in this case it was required.)
5. The link provided shows that the meter label used for this Registered Mail imprint was also used for a variety of other postage meter services, including fractional postage (as evidenced by the colon (:) following the denomination.) Keep in mind that back in the day (1936) many meters had only one usage and/or one imprint that could be made; this is evidence of an early use of a meter type that offered the flexibility to use many denominations of postage value.
All in all, I'd say you got quite a bit of information about your postage meter label by just referring to the various details provided in that link.
The rarity/scarcity and/or value of that meter label is a matter that was not addressed within the link and due to the limited collector population that would be interested in meters, the value may or may not be significant (remember, supply and demand is at work so even if it was "catalog valued" at a high amount, the market for such an item is limited which would have to be factored into any valuation quote.) Also keep in mind that the usage of that meter by a bank is probably the most common business that would have had need for the use of "Registered Mail" so that, too, would need to be considered.
As for storage, I'd keep the item in a Vario page within a looseleaf binder or else in a stamp stockbook of some type. You can put it away until you either have an interested buyer or until you are able to gain further information on the true value of the item ... but as we stamp collectors all know ... "value" is a relative thing.