Kinda. Or so it seems. Actually, its a different font. One font, the type 1, is sans serif meaning no serifs while the other (type 2) is a font which has serifs. Specifically, the "M" cones to sharp points. Again, look at top of the "M" . E PLURIBUS UNUM is also different in that on the Type 1, the "U's" line up! There are difference on the Obverse as well but they are really, really minute. Such as, the "R" in LIBERTY is a pegleg on the Type 1 Obverse but has serif's on the Type 2 Obverse. Thounsands of dollars will go to the person that finds a Type 1 Obverse Die paired with a Type 2 Reverse. The other IKE Types are shown below with regard to the specific earths but other difference do exist. The Type 1 Reverse can be found on the 1971-1972 coins (Philly and Denver) while the Type 6 can only be found on the 1971-D coins. Some very rare Type 1 reverses DO exist on some 1971-S Proof coins. The Type 2 Reverse can be commonly found on the 1971-S Proof, 1972-S Proof and on some 1972 CnClad coins for 1972 (Philly mint only) The Type 3 Reverse can be found on 1972 Philly coins as well as 1973-1974 and 1977-1978 CnClad coins (Philly, Denver) as well as their SF CnClad proof counterparts. The Type 4 and 5 Reverses are the Bicentennial coins while the Type 7 Reverse is only found on Prototype coins of which 3 are known to exist. Each of the "Year Type Variants" are commonly known as Type 1 and Type 2 such as those Bicentennial Coins. This means that 1971 has two Types. Type 1 (RDV-006) and Type 2 (RDV-001) 1972 has three Types. Type 1 (RDV-001), Type 2 (RDV-002) and Type 3 (RDV-003) 1975-1976 has two types. Type 1 (RDV-004) and Type 1 (RDV-005) As a "series", the Reverse Design Varieties (types) are broken into Type 1 through Type 7. As an individual Year, the "coins" are identified as Type 1 through Type 2 or 3. (i.e. BiCentennial Type 1, BiCentennial Type 2, 1972 Type 1, 1972 Type 2, 1972 Type 3, 1971-D Type 1, and 1971-D Type 2) Confused yet? Look at enough of them and it becomes perfectly clear.
^^Could not "like" more than once, unfortunately Edit - and I have all earth types except 7 ... the 4th prototype will be mine someday ... I just have to look through about 100,000 more 71 SB's, no big deal