#showerfaucet

Anyone know what brand of faucet temperature knob this is? I need to remove it and can't figure out how to get the knob off for repairs behind the plate. Thanks in advance!

renovation battle zone. 2 showers with old Moen posi-temp single handle showers, one has a bathtub but the push button diverter is by the handle not on spout. what are my options to upgrade the trim kit? can the diverter be switched to the tub spout? dream case being just put in a new cartridge...