A number of years ago I started to collect Obaks focusing mostly on the 1909 series and the 1910 series. Like most of my interests or goals, things changed with my collection and I pivoted to other interests. But recently my interest in the T212 1910 series has been rekindled. I did a search for a master front/back checklist but I could not find anything. So I took some time and after some internet sleuthing I was able to pull together a master front/back combination checklist.
Vintagecardboard.com which is a now a defunct website, had a simple and rather difficult to use basic table of the front/back combinations known at the time. The last cached version of the site I was able to access was dated from 2010 so much of the information in my table is over 10 years and and new combinations may have come to light since then...but this is a good enough start for me. Im sure after posting this someone will point out that there was an existing checklist and I simply overlooked it but I figured I would share my work anyways.
Here is the link to my checklist in Google Documents. Anyone can open and download the table so please feel free too.
T212 1910 Front/Back Master Checklist
And a couple pretty T212 pics to look at as well.
