The attachments aren't working
I found this info on them.... from link
https://www.canuckaudiomart.com/details/649517958-vintage-psb-passif-i-speakers-mint/
.......
These are model TMW-3 finished in real walnut veneer. These were among the first speaker models produced by PSB. The TMW-3 has one 1" dome tweeter, a 5" sealed back mid-range, and a 12" woofer. The grills are hot-glued in, but a thin edged tool used carefully can pry it off without damage.
These were the standard PSB speakers circa 1972-73 (PSB began as a company in 1972). They are very efficient, needing little power to achieve loud volume levels.
You can reach out to PSB for information.