[W&B] shutter to identify

[DColucci at aol.com]

W&B'ers
   
I picked up this shutter on ebay a year or so ago, from the Milan  Collection.
 
Its a small rotary shutter that fits on to the front of a lens and is  
secured by a thumbscrew which adjusts a band to grip the front lens hood.   Right 
now, it sits on a Darlot # 1 lens, which sits on a ROC New Model 1/4 plate  
camera.
 
At this time, I just have this quick digi-pic.  I will send more pics  soon.
 
It can be seen here:
 
_http://members.aol.com/dcolucci/shutt.jpg_ 
(http://members.aol.com/dcolucci/shutt.jpg) 
 
Obviously, the front plate is rotated, against the pressure of the spring,  
and is cocked and held ready to release with the chrome arm.  Lifting that  arm 
releases the circular plate which spins the aperture in front of the  lens.   
There are 3 notches around the shutter to change the  speed of the shutter.  
The only markings are 1-2-3 which denotes the  different shutter speeds.  The 
red arrow points to an arm that looks like a  piece has broken off.  I dont 
think the missing piece is of any  significance.
 
Here are 3 patents that seem related.  
 
_PHOTOGRAPH-CAMERA  SHUTTER - Google Patents_ 
(http://www.google.com/patents?vid=USPAT367986&id=8zZGAAAAEBAJ&dq=camera+shutter&num=50&as_drrb_is=b&as_minm_i
s=1&as_miny_is=1790&as_maxm_is=1&as_maxy_is=1890&ie=ISO-8859-1&jtp=1#PPP1,M1) 
 
 
_SHUTTER  FOR PHOTOGRAPHIC CAMERAS - Google Patents;;_ 
(http://www.google.com/patents?vid=USPAT284645&id=ySJQAAAAEBAJ&pg=PP1&dq=camera&num=50&as_drrb_is=b&a
s_minm_is=1&as_miny_is=1840&as_maxm_is=1&as_maxy_is=1885&ie=ISO-8859-1#PPP1,M1
)  
 
_SHUTTER  FOR PHOTOGRAPHIC CAMERAS - Google Patents_ 
(http://www.google.com/patents?vid=USPAT364413&id=rdBAAAAAEBAJ&pg=PP1&dq=camera+shutter+rotary&num=50&a
s_drrb_is=b&as_minm_is=1&as_miny_is=1790&as_maxm_is=1&as_maxy_is=1890&ie=ISO-8
859-1#PPP1,M1)  
 
Any thoughts ?  
 
Dan
 
PS - Shutters for 4x5 must be much more rare than larger sizes, but many of  
the unusual pre 1900 shutters I have come across, are in fact for  
4x5's....coincidence ?

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