Hi justcurious

Do you have any information on caliber rarity for the Mauser Type M? I just passed on one in 9x57 at the recent Borg auction and there is another in that caliber in the upcoming classic arms auction in S. Africa. I had thought the 9x57 might be rare but the appearance of these two so close together is making me wonder. I also used to think the .30-06 might be rare but I've seen a few of those as well.

thanks in advance for any information.