URW's Nimbus Sans is a copycat of Helvetica Neue. Swiss 721 BT from Bitstream is another copycat of Helvetica. Switzer: Free Neo-grotesk Font in 18 Styles - Freebiesbug Switzer: Free Neo-grotesk Font in 18 Styles. Freebiesbug Switzerland Condensed Extra Bold Font Free 53 - Facebook
Once you have your verified free "Switzerland Condensed Extra Bold" (with or without the 53 legacy), here is how to use it like a professional. switzerland condensed extra bold font verified free 53
The most verifiable answer is Theory 1 – an old archive naming convention indicating 53 glyphs. However, modern verified versions will have far more than 53 glyphs (usually 200+), so the "53" is a historical vestige, not a requirement. URW's Nimbus Sans is a copycat of Helvetica Neue