If you are using sp with grippy topsheets, I suggest replace them in about 8 to 10months. If it is like 802 type of pips then whack till te pips get broken lol.
Originally, the term hybrid rubbers were Chinese topsheets with a borrowed sponge from jpn or German sponge. Nowadays, people use the term hybrid loosely.
Yup looks like the blade was a premade tacket then got changed to new rubbers. I think we much better 7 ply blades now. All you need to do is look for one that suits you.