Family heirloom from the 70s hinged Sterling HFB etched bracelet.

What does sterling HFB mean?

HFB is Henry F. Barrows which started in 1853 in Attleboro, Mass. The bracelet has a slide mechanism for easy sliding on and off the wrist. This closes but is not snapped in a locking position but holds closed when wearing. It is signed on the sliding mechanism.