The higher amperage rating is not really relevant - that just indicates the max current that the power supply can provide. If the device pulls less than that, it isn’t a problem.
However, the polarity of the power supply is very relevant. If it’s is the opposite of what the ZX81 needs, and you powered it up, then yes, you may have damaged something.
The polarity should be shown on the power supply - usually it’s a diagram with three circles which illustrate which part of the connector is positive and which part is negative. There is often times one on the piece of equipment as well. Those diagrams need to match.
Okay, so in the background is a Consolidated P2Y seaplane. Those were retired and withdrawn from service in 1941 and sent back to Naval Air Station Pensacola. https://en.wikipedia.org/wiki/Consolidated_P2Y
So if it’s 1942, then it has to be in Florida at least.
But how do we know if it’s 1942?? 😨