Up for sale here is this rare vintage Jensen P275-Y mini speaker, marked ST-921 on the box. This is in the original box with the original paperwork, but it appears to have been installed at one point--there's some solder on the frame and the one terminal is partially missing, though you can still solder to the stub. It is a 16-ohm 2.75" diameter speaker. This is unused and is in great shape, and is guaranteed to work well for you. I believe this can be used in the Regency TR-1 and some Zenith radios. Please see my pictures for details.
US shipping and handling is $5, and international is $18. If you have any questions, please ask.
I have more speakers and other vintage electronics listed--feel free to take a look!