English A1200 PSU handle 110v US?

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If it's transformer based then look for a switch "110 - 220". If it's switchmode based then look for what the specifications says like "90 - 250 V AC" etc.

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Watch out for that 50 vs 60 Hz difference. That should be the only real obstacle to run PAL Amiga in USA (120 V 60 Hz).

The display may have difficulty dealing with PAL 50 Hz or being run with 60 Hz in some cases. In particular if it's a CRT.

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In a thread at abime.net I found this pinout for A1200.

abime.net - Amiga 1200 PSU.pdf (134 kB)

Pins: +12V, -12V, +5V, Shield, GND

So you are right. I had C64 TOD in mind.

That leaves the monitor. I'm still unsure how affected CRT ones are. LCD screens usually make 12-24V DC and thus has no mains frequency that path.

It seems the critical component is the input module and screen circutry inside the display unit. In particular input circuitry could be tuned to a specific frequency. Not even HDMI escape this issue..