Dorko 444 blank build

[MikeB52]

Evening gents. Searched for the 444 and found interesting threads on hardness and history of them and now I own one.
Here it is beside an older Dorko I picked up antiquing last week for comparison.

Blank is quite thick as you can see, with an O stamped up at the spine on the backside, mid blade..
Anyone with experience on this unique item, or suggestions as to plan of attack welcomed.
A faux frameback Dorko will be pretty neat, if I can do it right.
Cheers, and thanks.