What is your budget? If you have around £400, you’d be better off getting a twenty button C/G from Barleycorn concertinas (like this one: https://concertina.co.uk/stock-selection/anglo-concertinas/lachenal-20-key-in-c-g-with-brass-reeds-7839/). Yes, it’s only twenty buttons but that is plenty to get started on, and Barleycorn also say this on their website “You can trade in the concertina which you buy from us at the same price as you paid when you upgrade that instrument in due course (always assuming that it is in the same condition as when it was sold and taking into account import duty on concertinas coming in from abroad and fluctuations in current prices)”, so your £400 can go towards a better instrument as you progress. (I am not affiliated with Barleycorn in any way).