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The marcella spooks me a little. Cut the rust off w/razor blade . hopefully its not cell rott.
Had one like that( red rust both sides of the blade inline with each other)

I picked up a jewlers loupe yesterday while i was at the flea market.
It works great, just rather had one that clips on my glasses.
Only$5. Its 20x21mm

Do you have magnification?
Being photographer you probably do. I use mine to check for pits in the bevel that cant be seen by the eye. Also how deep in relation to the blade thickness. If its...

Personally 3-4 till you reach good steel then go to 1 .
The higher the angle the quicker you remove steel.
Once you reach good steel go to1 layer. THEN set the bevel.
Works for me. YMMV

Well you did good then.
Thats how i like to find them ( cheap). The most I've spent for a vintage straight was $45.
Made in 1905 and had never been honed or used. Had a very small chip in the blade...

I can agree with that!
It will teach you also not to waste your money and time on similar blades in the future.
That is unless it comes out for you. And you like sore hands and fingers. But thats...

Im with you Bob, looks pretty bad.
I personally , wouldn't waste all that time, I've been there done that.
I just turn them into tools like rust cutters like this one.
Was 5/8, now 3/8, and no...