Battery Terminals for Classics.

[Peter Monta]

I'm not sure what the original material was, but it's likely to be one of the springy copper alloys like phosphor bronze or beryllium-copper. For reproduction I'd suggest phosphor bronze, since there are some possible hazards associated with fabricating beryllium-copper.

You'll also need to plate with a nickel barrier layer and then gold, perhaps the "hard gold" variant. Best to use a commercial service for that.

In low volume the initial shape can be made by cutting a strip of material and peening it to shape over a steel form to make that rounded-over contact tip. Leave some extra length for the plating connection.