68 911S Tachometer

Nice condition with just a few breaks in the paint around the dial. This has a silver center button that is about twice the size as the Spedo and other gauges. This is the first time in more than 50 years that I have noticed that. Is this normal? I'm guessing that it is but I just never paid any attention in the past. I haven't tested it but am quite sure that it works and will pay return shipping and issue a refund of the purchase price, including shipping, if it is found to be defective. $250.00 plus shipping and and fees.

Regards

Jim