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plotstamp

I'd go with plotstamp first, if you don't like that, google a command called 'rtext' and the diesel command that goes with that command...comes in handy on occasion.

Having multiple plotters I can state that I do not like plot stamps. Nor do I like green eggs and ham.

Have you tried MTEXT with a FIELD? Start MTEXT, right click, Insert Field and the rest is up to you.

Avoid RTEXT like the plague, it's a proprietary object that never should have came to be. If you use it, many others won't be able to see it (even with Autodesk products).

I second MTEXT with a FIELD.