Manufactured by Iver Johnson and sold by J.P. Lovell Arms. The Defender were made from 1875 to 1888 and the Defender 89 from 1889 to 1895.
.22 short r.f. caliber, 7 shot single action Defender no 1 revolver, spur trigger, solid frame, 2 1/4" round barrel, fluted cylinder, birdhead grips, walnut or checkered black rubber, nickeled, marked DEFENDER
Almost sure this is what I've got--I think Hopkins and Allen also made same revolver but with 2 1/2 in barrel
Thanks for any info on assembly or any other info available