Hi all, I would like to put this lock up for sale and have no clue what it is or its worth? I do not have a key, so the attached chain is shown in photo, I would have to hack saw it off before sale. The lock measures apx. 2″ × 2 ¾″ front is marked P.R.R, S.D. Trade XLCR, The back is marked 20LA, made by Corbin Cabinet Lock Co. Patented Nov 5. 07 also has Dec 24.07, Apr 12.07, is this a railroad lock? There are marks on front and back as if some one clamped in vise, its minor and can be seen in photo between the P and R, lock appears to be solid brass, any one have an idea as to what i should ask? thank you all for your help.

