I have in my collection a
2021 uncirculated type I.
-
no mint mark - No engraver initials "WA" on obverse
- Full reeds
2021 uncirculated type II. (4ea)
-
no mint mark - Engraver initials "WA" on obverse
- Missing reed. (Missing reed is not in exactly the same
position on all coins.)
2021-W proof Type I.
- Mint mark "W" on reverse
- No engraver initials "WA" on obverse
- Full reeds
My collection is limited but I would say that the missing reed is endemic to the type II only. I can't speculate on what may or may not be on coins I don't have. Further I cannot state any rhyme or reason to these differences based on the limited amount of different types I have but:
Based on the number of uncirculated type IIs that I have, the missing reed seems to be a bad security feature if it is one. Taken on its own, it would have to be aligned in the same place on each coin of at least the 2021 year. The same goes for placement alignment of obverse and reverse of any year.
One other thing I am curious about is why the type Is do not have a mint mark. I assume they were minted in Philadelphia. With the trend in adding "P" to other Philadelphia coins, it seems inconsistent that they would leave it off the Type Is.