So....I went to change it out into something rigid with a touch more exposure.
Turns out it was a Treet Black Beauty, five shaves in.
I dunked it in alcohol to stave off the rust, and I'll try it tomorrow in a Merkur Bakelite.
I guess my Derby Extra review will be a bit delayed..
A Tech is the only razor I havent actually tried a Derby Extra in. Now that I have another Tech, I'll get around to it, if my Old Type lust fades anyway haha.