Harry-J, Are those numbers "hidden" on the plaque or are they in plain sight? I can't seem to find any. The plaque is rusty so I toke a rubbing and still nothing. However, if I look at it at an angle I can see the letter and numbers C 8 S or 5 I'm not sure on the last one. Any ideas on how to clean the plaque with out ruining it? Thanks TMLA