Hello, Bought my Heuer 2000 (973.006) in Sydney in 1985, and it’s been the most brilliant watch. Around 15 years ago, during service, the crown was replaced with a TAG Heuer version. Didn’t think too much about it at the time, but is annoying me now. Have spotted NOS Heuer crowns on eBay, but want make sure I buy the right type (Tag Heuer can’t supply one). Can anyone help on the spec, diameter, push-in (or not), etc. As well as the best place to buy. Many thanks.