Yeah a number of 150-350 series poses were printed with very dark ink with P350 and Old Mill backs. The vast majority of the dark ink cards feature poses which were printed with SC 150/649 backs. There's a pattern in there somewhere. I wrote a 4-part series about it on my site about a year ago.
Here are a couple dark ink Old Mills and a lighter one I've owned.
Last edited by Luke; 07-02-2018 at 06:25 PM.
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