Spring bars for gold watch

Good morning OF,

Wondering what type of spring bars do you use on your gold watches? Are you afraid of steel eating into the softer gold?

Cheers,
Mike

When you think about it soft spring bars would be about as effective as a fart in a cyclone

Fair enough haha

I just bought this from a member. It’s an IWC cal 89.( 18k rose gold). It came on steel spring bars and new generic straps in the sale. While back referencing the watch ( because it changed hands in the forum before) I found that it had at one point had matching rose gold spring bars.

I contacted the awesome seller and he said he don’t remember if it came to him that way. He was kind enough to search through his stuff to check.
I was not sure if it’s solid gold or plated. But I thought they may be original to watch as they match the watch rather perfectly.
Sure enough he found the spring bars and took the effort to ship to me separately.
Here they are

Any cal 89 owners or experts know what they are made of?