Greetings, and here is my latest contest. Identify the following classes of hub doubling from the 14 examples illustrated (12 Lincoln DDOs, 1 Lincoln DDR and 1 Jefferson DDO). There are hybrids, but try and identify the primary class (or both if you can). If you are extra sassy try and guess the date and DDO #...
To make it easier, you will find: Class I (X3); Class II (X3); Class III (X1); Class IV (X2); Class V (X2); Class VI (X1); Class VIII (X2)
01 DDR
02 DDO
03 DDO
04 DDO
05 DDO
06 DDO
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