VARIATIONS

1920:  Type 1 - Heavy steel 176757

       Type 2 - Light steel 408973

1921:  Type 1 - S.G. Adams dies, contrived "2" of date

                            110648 - 201305              (90,658 P)

       Type 2 - S.G. Adams dies, graceful "2" with vertical join at

                base        378083 -

       Type 3 - Grimm dies, sloping join at base of "2" (Truck)

                            513513 - 533984              (20,472 P)

1922:     Thin legends, or thick legends.

          7-digit (narrow dies or extra long) expected in

          Black Hawk county 12-10000 - 12-10200.

1923:     Heavy steel, or light steel.

1924:     7-digit (narrow dies or extra long) expected in

          Dubuque county 36-10000 - 36-10600.

1925:     29-10000 - 29-10461 have non-serif 1st "1".

1940: Type 1 - Rounded date with pointed "4", counties 1 - 54,

          also late issues 56-9609, 77-50214, 90-9724.

         (Verify 2,8,13,16,20,21,30,33,34,41,42,43,53)

      Type 2 - Squared date with flat-topped "4", counties 55 - 99,

          including early issues 56-6527, 77-25169, 90-9645.

         (Verify 58,59,60,62,65,67,68,74,76,80,83,84,98,00)
1946: Type 1 - Large loop, closed "6" of date, counties 1 - 21.

         (Verify 1,2,4,6,12,17,18,19,21)

               Break seems to coincide with pairs vs. singles made.

      Type 2 - Small loop, open "6" of date, counties 22 - 99.

         (Verify 22,23,26,27,28,30,34,36,37,38,40,42,44,47,49,

           51,53,54,55,59,63,64,72,76,80,84,88,93,95,98,99,00)

1947:     Steel or plain aluminum

          Late issues in 1948 are waffle aluminum - 4-5187, 13-5630,

          21-6573, 23-15504, 27-3431, 31-17297, 65-3974, 73-7030,

          77-56706 - 59225, 78-18312, 82-28861 - 30838, 87-4016 (4,508 P)

1948 TAB:  Plain aluminum; late issues waffle aluminum.

1949:     Waffle aluminum.

          Late issues have no corner holes 5-3989, 73-7267,

          78-19125, 86-7220, 99-6597.

1950-51:  Late issues steel, not aluminum (77-80167).

1958:     Counties 1 - 40 have tab slots; counties 41 - 99 (and

          late issues of 1 - 40) have no tab slots.

1959:     Polk County issued 60,000 or 65,000 P fully reflective

          galvanized steel plates.

          (Reflective     7/7 860 - 56959, 74503,

           Non-reflective 7/7 73897, 91061 - 98454)

1960:     Small prefix (Counties 1 - 2) or large prefix (Counties 4 - 9).

         (Verify County 3)

          Late issues aluminum, not steel.

          Counties 1 - 3 reported with small prefix, not large.

          Reflective plates reported in one county.

1962:     Late issues have unpainted back, not light gray back.

1964:     Hyphen -    1-1665, 2-3080, 4-518 - 4-2307, 6-2061 - 6-9489,

                      8-519 - 8-10874, 9-325 - 9-5788

          No hyphen - 2 418, 3 3167 - 3 5124, 4 6444, 7 3168 - 7 50536

          Late issues have unpainted back, not green back.

1965:     Late issues have unpainted back, not dark blue back.

1966:     Thick 1958-65 dies or thin 1967-78 dies.

1967: Type 1 - Curved "6" of date - 88 counties, plus late issues

               31 22222, 49 8665, 56 18539, 82 57449 - 62104, 00 4841,

               and remaining Story #85 5076 - 14379, 20160 - 23959.

      Type 2 - Block "6" of date - 10 far southeastern counties from

               Dubuque south to the SE corner, plus Story #85 18276

               and Non-Resident #00 804.

               16 5282, 23 2298, 29 17686, 31 2690, 44 3498, 49 6394,

               56 11776, 58 4008, 70 8587, 82 52302 (115,326 P)

1971: Type 1 - "71" in UR corner - all counties, including

               3 1606, 20 1818, 58 4550, 70 6151, 74 4020, 77 148965.

      Type 2 - "IOWA 71" between bolt holes - late issues

               3 6738, 20 3979 - 3998, 58 5532 - 5617, 70 18762,

               71 8756, 74 6464 - 6500, 77 151653 - 151684 (179 P).

1973-74:  Late issues have bolt holes, not slots.

1977-78:  Late issues have bolt slots, not holes.

1975-77 NON-RESIDENT SERIES

    HNA000 -     HNK803 "NON RESIDENT" at bottom, short dies

   HNL 242 -    HNR 863  No legend at bottom, normal dies

0/0 HNU445 - 0/0 HNX149  No legend at bottom, normal dies

1979-85 BASE

1979 Type 1 - Debossed, green back

1979 Type 2 - Debossed, unpainted back (Black Hawk JAB 021)

1979 Type 3 - Embossed, unpainted back (Black Hawk JAH 980)

Debossed types issued in 52 counties:  7, 10, 12, 14, 16, 18-19,

23, 26, 28-30, 32, 35, 37, 41-42, 44, 46, 48-52, 54-56, 58,

60-62, 70, 76-77, 78?, 79-83, 85, 87, 89-93, 95-98, 00.

Embossed types issued as late issues in at least 14 of the above

counties (7, 18, 32, 37, 42, 48, 50, 52, 77, 78, 82, 90, 95, 97),

as well as for all issues in the remaining 47 counties.

Pottawattomie (78) embossed FQH 094 seen. (Verify FQA-FQG)

EAC 164 "MARION", EAW 659 no county.

1986-97 BASE

1985 Type 1 - Aluminum, bolt slots, unpainted back

1985 Type 2 - Light steel, bolt slots, white back

     Type 3 - Light steel, bolt slots, unpainted back

     Type 4 - Heavy steel, bolt holes, unpainted back

     Type 5 - Aluminum, bolt holes, unpainted back

STICKERS

2002:     2 different formats reported.

2005-06:  Large date with random serial, or small date with serial

          matching plate number.