Reason: Last version
Version 7 had only one switch, for servo power, as on the standalone controller.
The PTH diode was changed to a surface-mount version.
As the Standalone controller became increasingly popular and went into production, the sentry shields lost their original niche. Only one batch of the Version 7 shields were produced due to a lack of interest, and no sentry shields have been produced since that time.
I have no photos of the Version 7 shield, as they were rushed out during a heavy period of standalone controller assembly. If anybody has one of these, please email me a few photos of the shield to put up here on the site.