The bicycle looks like Giant Allegre, about 1992. I wouldn't expect a number peg at that level. Had it been threaded, I would have suggested a mount for a CO2 cartridge holder, as an alternative to a pump.

Edit. CO2 cartridges were a popular option with triathletes, who often used mid-range sport bicycles, though dedicated triathlon bicycles were starting to make inroads at the top level by this time.