Tripp-Lite Keyspan USA-19HS.
As new, factory packed, cable and CD.
The gold standard in USB-RS232 (serial) adapters.
Recommended by AP and SB etc. Reliable.
Selling, as this is a backup - and I have two of this same model + a 4port model Keyspan.
Pics here:
https://www.dropbox.com/sh/0b82ub7b3...6zpRqCz-a?dl=0
$55 shipped.
PMs only thanks.