I'm trying to post a photo or two as it's probably better to let the photos do the talking. Sideplates are just that, and false sideplates have screws or pins added for style or possibly deceptive reasons, I do not know which. I have seen only one in 25+ years as a student of doubles. I have seen between 50 and 75 sideplated boxlocks and at least two "half sidelocks" or hybrid boxlocks (or whatever these semantic stickelers choose to call them). It's probably best if I let the photos do the talking (to OWD). Their posts made no attempt to address or further the understanding of another members posted question, just bold faced territorial nonsense. I am sorry to OWD, I was truly trying to address your question directly and with integrity, so if you are still interested in the correct answer to this posted question, just say so, and I will post photos of a semi-sidelock for you to see, and these other guys can fill their socks with manure and beat each other to death over the proper nomenclature.