The AS was first created in a vertical position with the strobe on the right side of the horn facing vertically, but sometime 2002, the strobe is in a horizontal position above the horn, like most other current Wheelock strobes.
The AS was first created in a vertical position with the strobe on the right side of the horn facing vertically. Then in 1998 when the NS was introduced, The strobe was replaced with the RSS horizontal position above the horn, like most other current Wheelock strobes.