If you're going to travel back in time and purchase a safe or alarm system, then the following information may prove useful. Alternately, if you are one of the writers or producers of the hit show Mad Men, maybe a character there would need to buy a safe. I've never seen Mad Men, though. Is it set before 1968? Then maybe one of them guys needs to go into the future and buy a safe. Timecop style. Whatever. You can click on these to make them bigger, if you want.