1506s are indeed more in demand than 1039s, but the premium is smaller than for 7912s. Maybe something like $1,500-$1,800 for a 1039, $1,700-$2,000 for a 1506, and $2,500+ for a 7912?
Rough numbers, others will know better than me. But in the past two years, I've bought and sold 1506s and 7912s from/to other collectors within those ranges
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