The Miniature Speed Graphic is strictly speaking a pre-Anniversary
model, manufactured from 1939-1946. It immediately preceeded the
Anniversary Model Speed Graphic, and in fact overlapped with it for all
but the first year of production. However, there was no 2x3 Anniversary
model, so the Miniature Speed Graphic filled in that part of the Graflex
product line.
The Miniature Speed Graphic is often confused with the 2x3 model of the
Pacemaker Speed Graphic, which looks similar, but which often features
the highly desirable Graflok back, which accepts modern style rollfilm
holders. The Miniature Speed Graphic uses the Graphic (spring) back
which does not Graflex roll film holders, so buyers should be sure to
obtain a supply of 2x3 sheet film and holders. A 2x3 Grafmatic sheet
film back was also made, and is quite handy.