candado3 wrote
Pattent numbers for this lock are US Patent #72378 US Patent #85805 US Patent #102810.
If anyone has any further information about this padlock or “MERKEL & MEIER” please let me know.
Don’t know if this helps any but I found two of those patents in Locks and Lockmakers of America, Rev. 3 Ed. by the late Thomas F. Hennessy in his listing of padlock patents on pgs. 118-119:
Patent No./Date/Type of Lock/Inventor/Residence
072,378; 12/17/1867; Padlock; J. Effler; New York, NY
085,805; 1/12/1869; Padlock; C.H. Eiffler; New York, NY
Pete Schifferli
[unknown]