There isn't a lot of Vintage Advertising for chassis punches, but I did manage to dig up a few. First up are a pair of generic ads for the ubiquitous Greenlee chassis punch line.

Refreshingly sparse, the above advertisements just presents the facts; albeit they forget to mention you need a 3/8" pilot hole. Still, they work exceptionally well, and many an ancient Greenlee punch still seems to perform today; providing they were not abused. Note that the advertisement above right shows when Greenlee is starting to aim their advertising squarely at the radio or audio technician. The punch sizes also started being standardized towards things like tube socket sizes and strain relief clips! There are a lot of vintage Greenlee punches out there, though they still do command a fair price on the 'used' market.

Above we see a hard-to-find advertisement for any competition to Greenlee. Well, Walsco has some chutzpah, my friend. Locating their main plant in Rockford, Illinois (close to the Greenlee plant!), they do exhibit some bravado in their advertising. Interestingly enough, I always thought of Walsco as a distributor, and they did carry of line of chemicals aimed squarely at the radio/TV service man. These included radio dial oil, 'Walscoflux', 'Stripvar' (for removing varnish from magnet wire prior to soldering), and 'No Slip' (for those slippery drive cords and belts). Getting back to Walsco chassis punches, they claim to have an exclusive electro-coating, which reduces friction. This in turn means less effort (torque) is required to punch through material. Secondly, they advertise their punches do not need lubrication! The sizes and shapes are identical, so this should make it easier to find a vintage punch to add to your collection. However, I haven't found a single Walsco punch to date. The Greenlee punches are much more common, followed way behind by Pioneer. Whichever brand you do find, getting a 'backup' punch for common sizes isn't a bad idea; it may get a little expensive, however.