I own both shevlin and top boxer old school gloves. The 16 oz Shevlin's are great for sparring and perhaps mitt work. The top boxer O.S gloves have a similar padding style but it feels slightly denser because its more tightly packed. I haven't used them to sparr but I suppose you could. Provided you find a willing partner. My pair are not labeled with a weight but they look like a well padded fight glove.
I have only used mine on heavy bag sessions and mitts.
One thing I will say is that the top boxer OS gloves are not for big hands. I would describe my hands as average sized and at first they barley fit. But now they have taken shape to my hand and fitt great. They are probably my favorite pair of gloves right now next to my 10 and 12 oz winnings. Thats whats great about the soft fill gloves- they kind of form to your hand. Also its worth mentioning that they have narrow wrists. Which is great for me as I have slender wrists. Not like Grants or other gloves who seems to be making gloves for gorillas. The thumb position and design is also superrior to shevlin. The liner on OS gloves is the only neg in my opinion. I suppose for continuity- being an old school glove Muhammad uses a canvas like material for liner. I would perfer a more modern nylon/satin liner.
Hope that helps.