JULES RICHARD? STEREO CAMERA SHUTTER FRONT LENS #61 *RARE EARLY*

I’m not sure if this is a Jules Richard made shutter. but it has certainly the same feel to it.
Shutter in overall very good and in original condition. It shows minor scuff marks and wear. Shutter mechanism working perfectly. All speeds pretty accurate. Shutter speeds setting smoothly. B settings works. And works very cusrious. One has to set it beyond 7. Than release, the shutter open slowly to bulb and shutter cock mechanism locks halfway in place. Than releasing the shutter again closes it quickly. distance between the middle of where the lenses would be is exactly 9cm.. Serial number is #61 and stamped letters are B té S.G.D.C.