Just wondering as I've not done before. When I return to Thailand with a re entry permit, obviously that will be stamped as used. Do they put any other stamp in my passport or do I just revert to my original extension stamp. Hope that makes sense.
TLDR : Answer Summary
When returning to Thailand with a re-entry permit, you will receive a new entry stamp that includes today's date as the entry date, while retaining the original end date from your previous visa extension.