1922-P VAM-2 Machine Doubling

From VAMWorld
Jump to: navigation, search

1922-P VAM-2 Machine Doubling

Strike Doubling, also known as machine doubling, is a doubling effect created on a coin's device(s) during the strike itself. Paraphrasing Van Allen, strike doubling creates "flat, shelf-like shiny tops that narrow the device." This is in contrast to die doubling, which shows "rounded tops that widen the device."
Strike doubling does not create a new VAM since the effect is likely on the one coin only and is not the result of a different die variety, but likely from loose dies.
1922-P VAM-2 Machine Dblg.jpg
Step like machine doudling can be in any direction.
Ja1922-Pnachine.jpg
This is a personal theory derived from observation. Strike doubles on peace dollars tend to be rotational. The example below shows clockwise strike doubling around the rim. The die was allowed to rotate during the strike. Morgan dollars tend to have more lateral strike doubling. The die shears
in one direction. I believe the reason is that Morgans have a denticle ring around the edge that acts like a star washer when the coin is struck which
inhibits die rotation.
File:Ben100-space/1922-P sd 22.jpg
File:Ben100-space/1922-P sd Iray.jpg
File:Ben100-space/1922-P sd Bray.jpg