I made a comment above explaining why I think it's a monospaced font with each character 5 dots wide, with 2 dots of space between characters. The 1 uses 3 dots and the 0 uses 4, while the period and colon use 2 dots of width. But each of these less than 5-dot-wide characters also is surrounded by more than the typical 2 dots worth of space, proportional to the assumption that each character is assigned 5 dots of width.