Hi Deb; I think I have had one of those since the 1980's. Slightly different look, but they talk about the "original" so I think mine must be one of those. Small, all metal , shut off button, easy to disassemble and clean (after about ten years).
So mine has been in service for closing on 40 years and we still love it!
EDIT) I should mention that we have no lack of water here and as far as water pressure goes … well it's 125 psi at the freezeless hydrant outside. So I can report that these units will work with any water pressure above the stated minimum. With our Paloma on demand water heater you can literally take as long a shower as you like, until we ran out of propane...
On full flow our spray can kind of sting its that hard.
After 35 years plus , the shower head is unaffected by the high pressure.