I have questions about several different Wheat cents, been going through all of mine. I am putting them all on one feed, I hope you don't mind.
First, I have 3 different 1957 D
Wheat cent with a "blob" between the B-E on "Liberty." Is this common, or an error?



Next, on one of those 1957 D's that has a blob, also has a blob on the date ...on the nine, is that from wear?

Third, there is a trail from the Date to the mint letter on this
Wheat cent 1952 D. Again, is this from wear?

Lastly, I wondering if this 1934 D is an RPM?



As always, thank you for your time.