I purchased the Brownie Twin 20 at Savers (a thrift store) for $4 two years ago, and discovered an ancient roll of Ansco black-and-white still loaded with only four or five exposures used. Unsurprisingly, the found photos didn’t come out, and neither did the photos I attempted to take on the remainder of the roll.
Finally, a year and a half later, I did a real test of the Twin 20! Back in February, I loaded it up with Ektar 100 speed, spooled onto a 620 spool.