Definition:  Doubled lips on the Roosevelt Dime due to die clashing.

Characteristics:  The secondary doubled lips are inside the design parameters. 

1.  In other words, the outside set of lips are consistent in distance with the strongest hubbing.  See the first set of overlays below.
     This can usually and most easily be seen by tracing the vertical separation line north from the inside upper lip. 
     It will divide the distance between the inner and outer nostril. See photo with arrows below.

2.  To date, all examples of "hot lips" have been found on coins with die clashes.  See the second set of overlays below.

3.  From a search of 638 dimes from 1946-1970, no "hot lips" were discovered that did not also have remnants of die clashing.

4.  The 1946 HL-002 has an earlier die state with a light die clash, but without doubled lips. 
     However, the "hot lips" on this specimen are rather ill defined.
     This is as close to a "smoking gun" as we currently have to prove that these are a result of die clashing and not from hub doubling.

5.  I don't understand the physics of how a die clash could produce the doubled lips.
     However, the preponderance of evidence leans heavily in that direction.
     What else could account for the fact that NO known examples of "hot lips" exist without also having remnants of die clashing?

6.  Class VIII (tilted hub doubling) is the proposed alternative.
     I have catalogued close to a thousand such doubled dies.  They are all unique in their doubling.
     To be sure, they affect a small area, but the angle of the tilt, the pressure of the hubbing, and the time of the snap back, combine to make them unique.
     The doubling on these "hot lips" dimes are similar not only in location but also as to how the design is doubled.