Hi All - In full agreement with Richards assesment, in addition to this one must take into consideration the physical manufacturing characteristics that contribute to various "anomolies" that can take place.
1. Multiple Die Pairs are utilized to stike Business production strikes, each die was hand set in this era so no two dies will display perfect diagnostics for ancilliary details of the coin - i.e Date - Mint Mark - Legend, this inconsistency leads to creation of RPM's, VAM's, etc.
2. Die Pair Marriages {the use of different Obverse & Reverse Dies} are inconsistent at best along with the U.S Mints documentation of these marriages.
3. Physical characteristics of the pre-struck planchet. Material purity {i.e - Trapped gases or imperfections, these usually cause lamination defect}. Planchet thickness, diameter prior to forming the raised edge & concurrent reeding, some will be offset due to this condition and when struck, can magnify the defect of the planchet.
4. Actual position of the planchet in the coining chamber during striking. There are conditions related to the pressure applied during the strike causing several issues of both weak or extremely strong details, tilted collar striking, off center conditions even die clashing {contact of Obverse/Reverse dies without a planchet in the chamber}.
5. Die cleaning & Die erosion also has an impact, this is especially true for a coin series that is struck in very high quantities such as the Mercury - Liberty Head Dime variety.
Although the list above could certainly be expanded upon, these are the primary culprits for inconsistency between common production strikes.
In reviewing the pictures of the 1943 Merc in question, it appears it is struck slightly off center {a South - Southwest strike} attributed by both placement of the date and what looks like a small amount of Finning on the edge of the coin at the 7 O'Clock position. The 1943 series had over 324 Million struck between the mints, many various anomolies exist for the series.
Sorry for the long post, hope the info helps.
Happy Collecting - Jim