That reminds me, Preston made a mitre (miter) square. It is sort of a saddle
square.  I have a copy made by Smallwood in England post-Preston (never
found a need to use it yet).  I think Footprint also made them in the 1970s
or so.

See:
https://www.jimbodetools.com/products/preston-6-inch-mitre-template-and-squa
re-73772
 
and some more picks at:

https://www.nonesuchtools.com/preston/index.htm


-----Original Message-----
From: OldTools [mailto:oldtools-bounces@s...] On Behalf Of
Zachary Dillinger

I have a brass saddle square that came with a set of mid-to-late19th century
English sash joiners tools, all bearing the S Bradshaw owner's mark. Also in
the box, though bearing a different owner's mark, was a saddle miter square.

http://galootopedia.com/old-tools_wiki/images/2/26/Saddle_squares.jpeg
http://galootopedia.com/old-tools_wiki/images/f/f2/20200517_200010.jpg

Both tools appear to be user made, so perhaps they weren't commercially
available until a little later.
--
Zachary Dillinger
517-231-3374