Old castell padlock pat n 430168

[femurat]

I got this nice padlock some time ago and was going to make a key for it.

I found a key cut quite shallow that seemed a bit too big but could fit. Filed it until it entered the keyway. Then I blackened it with a candle and tried to impression it. Got not much luck because I couldn't find a way to put pressure to the pins to leave marks. Pulling the lock apart with my fingers was not enough, and I don't want to ruin this beauty so I'm not going to force it with tools that could leave marks. Does anybody have some hints on how to impression it?

I shimmed it open and analyzed the pins. The bittings seems very similar to a couple keys I found with an online search. The first pin long, the second one very short and the last two almost the same length as the first one. Is this padlock part of a big master key system?

Thanks :)