Hi Mike - First let me say that a couple folks have referred to the list I posted as "Tim's" and I want to make sure it's clear that the list I posted is a collaboration between myself, Jim Rivera, Brian Weisner and another long time tough back collector and T206 researcher.
As far as the Coupon Type 1 and BL 350's it's another debatable point. When we decided to add them to this list we discussed there position at length. Our reasoning for placing the Coupon's lower is due to the number of complete, near complete and sizable partial sets that exist and the lack of known large BL 350 collections. Maybe scattered across the collecting community there are more BL 350's than Coupon Type 1's but based on our information we feel the BL 350 is slightly more difficult. But with any other back comparison someone else may see it differently and that's all good.
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