Greetings,

I recently acquired from the "rummage sale" of Washington School of Photography a lovely 12" f/6.3 barrel lens marked (on the front):

DOUBLE ANASTIGMAT F:6.3 No. 5a 1794 EASTERN OPTICAL Co.

It is marked on the barrel:

EASTERN OPTICAL Co. BROOKLYN-N.Y.

On the barrel at the very front is marked:

E. F. 12"

The barrel also has a foil label marked:

Burke & James Inc.. Chicago 4, Ill.

On the rear is the marking:

1794

Does anyone have any information about this lens?

Thanks.