This one just recently came to occupy a space near my loading bench, a Lyman No.5M. Basically nothing more than the old No.5, introduced in the early years of the 20th Century by John Barlow's Ideal Mfg. Co. and continued by Lyman until the late 1940s when the No.55 was introduced and the No.5 disappeared into the mists of time. The change, which came about in 1929, was the modification of the old 3-slide arrangement of the No.5 into a single adjustable slide with a micrometer screw arrangement. These were intended for metering the larger charges of rifle powders, and it was not recommended for use in charging pistol and revolver cartridges.
This one came with an original box, the brown waxed paper wrapping, and a 1942 dated pamphlet describing the various Lyman/Ideal reloading tools of the day.
Attachment 214511 Attachment 214512
Jim