Thanks for all the replies on this. I can confirm, from the profile pics, that it is a microtome.

I'll head to threads on honing them, however the blade is in pretty bad condition anyway, so I'm not sure how much success I'll have.

It's a good learning curve anyway. I bought a bunch of cheap, busted up razors to practise with. I've been maintaining the edge on my straight razor for a year, however it was new and shave-ready when I bought it, so only needs a little touch up on the 5K and 12K, plus some stropping to keep the edge. Never had to reset a bevel, or polish out marks and pits before.

I'll get some tape, and start again with this one.

Mark