Re: Gundlach 5x7 Rapid Symmetrical W.A.

It arrived today.

I learned it has a Waterhouse slot, 2 air cylinders and springs that
look as modern as any (I guess I never really thought about helical
tension springs looking the same).

Number (serial?) on the back, nothing identifying the shutter it yet.

f/stop scale marked 6.2 - 45, so it must be newer than US stop
style..but Waterhouse stops certainly SEEM older than 'real' f-
numbers.

The scale about the f-stop scale must tell something about the
Waterhouse stop required, otherwise I don't see a point to labeling
the lens body if the Waterhouse stops are individually marked and
spend more time external to the lens than part of it.

I'm easily impressed - little lenses that throw large images.