If you have been looking at newer coins for doubled dies you have probably noticed an explosion in the number of hub doubling varieties on US coins since 2022. Some are even of classes that we thought no longer possible in the single-squeeze era (Class II/VI: Example 1 and Example 2)

And I say “hub doubling” there since this explosion is clearly not limited to working dies. I suspect there is a large number of doubled master hubs/dies and working hubs on the 2022-present quarters.

For those two reasons (unexpected and unexplained resurgence of certain classes of doubled dies and an abundance of common doubling likely attributable to earlier in the die making process), there needs to be careful study and consideration for any and all doubling before we can confidently attribute them.

I hope here to publish my current observations so that others can search for more examples to support or rebuke how I would currently attribute this varieties. I can only get my hands on so many coins, and I have not even seen a Denver or San Francisco minted example of some designs, so I am not confident in what to label some of these as.

Do not take any information here to be fact just yet! But please help confirm or rebuke information here where you can.

Description: Close doubling to the NW on the first 2 in the date and very slightly on the 0. Upper right side of the last T in TRUST doubled to the north.
Year(s): 2022
Mints: Philadelphia (Unknown on Denver and San Francisco)
Known designs: Angelou, Ride, and Mankiller (Not as common on the Mankillers as on the other two, seems to very clearly be a working hub(?) used at the start of the year and possibly decommissioned during production of the Mankiller quarters)
Other Info: N/A
Current Attribution: Doubled Working Hub
Confidence: Moderate
Further Research: Does it exist on Denver/San Francisco? Does it exist on Otero-Warren or Wong quarters?

Description: Eye is doubled to the NE.
Year(s): 2022
Mints: Philadelphia (Unknown on Denver and San Francisco)
Known designs: Mankiller
Other Info: N/A
Current Attribution: Doubled Working Hub
Confidence: Moderate (Not many examples found, possibly hard to see it late hub/die state)
Further Research: Does it exist on Denver/San Francisco? Does it exist on other 2022 designs?

Description: Eye is strongly doubled to the E.
Year(s): 2023
Mints: Philadelphia (Unknown on Denver and San Francisco)
Known designs: Kanaka'ole and Roosevelt
Other Info: More common than Obv #4?
Current Attribution: Doubled Working Hub
Confidence: Moderate
Further Research: Does it exist on Denver/San Francisco? Does it exist on other 2023 designs?

Description: Eye is strongly doubled to the NE.
Year(s): 2023
Mints: Philadelphia (Unknown on Denver and San Francisco)
Known designs: Kanaka'ole and Roosevelt
Other Info: Less common than Obv #3?
Current Attribution: Doubled Working Hub
Confidence: Moderate
Further Research: Does it exist on Denver/San Francisco? Does it exist on other 2023 designs?

Description: Strong doubling to the north on the hair details above and left of the ear. Eye is also slightly doubled to the NNE.
Year(s): 2023
Mints: Philadelphia (Unknown on Denver and San Francisco)
Known designs: Kanaka'ole
Other Info: Rarest of the 3 Kanaka'ole obverse issues?
Current Attribution: Doubled Working Hub
Confidence: Low-Moderate
Further Research: Does it exist on Denver/San Francisco? Does it exist on other 2023 designs?