EDIT Ben/Բեն is the second letter of Armenian alphabet. There are only few variations of its form. Merely the length of the horizontal stroke was varied. The oldest forms of it have an elongated horizontal stroke with a small descender at its end.

The small letter Ben occurs in 10th Century. Its horizontal stroke is on the line. The descender becomes sometimes a tail turned to the right. This feature is very marked for other letters with descender.
In 14th -19th Centuries the descender of arc atrophies and eventually disappears. The horizontal becomes much longer as the head, which is now parallel to it.

Ben is pronounced in western Armenian as [pʰɛn] / [pʰ], and in classical / eastern Armenian as Latin B.

The numerical value of Ben is 2.
The biblical Name of ben is Բովանդակ/Content.
Sources:

Album of Armenian Paleography
Michael E. Stone, Dickran Kouymijan, Henning Lehmann
Aarhus University Press 2002

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