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The simple markings on photo does not have the Anode and Cathode marked.
Please reload the page as I have updated the last image.
Yes, 1N4148.
have you removed this one?
For the helpers: Linking in the thread on UK Vintage Radio. There's more relevant info there
These two were missing from the start, my first thought that it might be the same as the other one you marked, but the other one in middle i do not know.
the other one in middle i do not know
If the two holes are connected to the opamp pos and neg supply, I expect it's for a decoupling capacitor
looking at the photo of the solder side, looks like there wasn't ever something mounted there. The pads look unused.
Great!
One is TD300 the other TD500