Looks like the sort of jig that would be used to grind a square toolbit at 45 degrees, to make a Graver.

Howard

What about using a pair of them to clamp square stock to the milling table at 45deg and level with the table!!!

Mine came from a UK tool maker circa 1950. I have never used it,. It is branded

SMYTH TYRRELL & COOK

…..MSFORD  (The first 4 letters or so are unreadable)

Looks like it says CHELMSFORD at the bottom

And this is the Inside out “V” block

The inside-out V-block allows you to eg drill a hole across round stock and then flip it 90 degrees to drill again which a normal v-block doesn’t. We had one at work but of course one day the clamp went missing and it became useless.

I haven’t found anything about the specific item … but I have found a patent by Smyth-Tyrrell in a similar field of endeavour:

https://worldwide.espacenet.com/patent/search?q=pn%3DGB139248A

… and it’s earlier than we anticipated.

MichaelG.

I was looking a while ago, but got sidetracked.
I came across this in The British Newspaper Archive, but since I don’t subscribe, I couldn’t access it

So by 1936, maybe Smyth-Tyrrell & Sons, if it’s the same company, moved from New Writtle St to London Road.

Not in Grace’s Guide as far as I can tell, but might be in Kelly’s directory.
I cant find access to a free copy but there is a 1926 one available for download.
There’s stuff in the local reference library, but that doesn’t help from Buxton.
See also; it looks like Fred died in Nov 1939
https://www.findagrave.com/memorial/205420012/fred-smyth-tyrrell

None of which helps identify the object of course
Bill

Just found the complete catalogue on-line – Its not in there though!