The older models do not have the model on the front of the case.
For older models, before they started using the Z S series as designation of model, the lable on the back of the TyniSA will tell you.
Mine is marked " TyniSA ultra" so it is the ZS405.
If you have the plus, it will be on the lable. Then you compare your back lable with the WiKi as shown.
It's that simple.
Clyde KC7BJE
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From the photo on the wiki we see this - look at the top bar of the case, along with Ultra+ in the bottom right logo: