Vintage Rare Mawi swiss watch square case (TV dial) , Automatic , needs service

The watch works, but there is some issues1- the strap is not original, just a cheap one2- i couldnt open the case back, maybe it needs a special tool for that and im not a watchmaker3- the log came out when i tried to change the date, but it just fit back in secure and wouldnt fall.4- there is scratches on the plastic crystal