Help with EPNS (Electro Plate Nickel Silver) "LB"

Thank you for any help regarding a pair of candleholders I have with EPNS ( Electro Plate Nickel Silver) LB… the remaining letters “LB” and the actual Lion and Unicorn mark,…having a problem finding anything on this. After reading about the history of EPNS, I got a bit lost in the details of years, Country, Etc…, then later reading about some fake Sheffield silver…blah, blah ! Any history would be great! Thank you, I am a new member and my first post…sorry.

Your candleholders were made by Lehman Brothers Silverware of New York.