Use PS/2 (or AT, with a passive adapter I also have for sale) keyboards on PC and XT type systems.
Tested with an IBM PC 5150.
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eBay doesn't allow custom shipping service names.
"Economy" will be tracked airmail to most countries, but untracked to a few more remote ones. 1-2 weeks usually, but can take longer.
"Expedited" will be DHL Express. 3-4 days usually. Exact quotes vary depending on the country. I can refund if you are overcharged.