its not a high end handmade mauser, only a sporter but interest none the less. one of the very few factory cartridges made when nobody ask for was the 7x54 Lapua.
a 6,5x55 swedish necked up to 7 mm to copy the 7x57 Mauser. there was never a factory made rifle for this round beside of the fact it was so close to the 7x54 Fournier they use it without asking questions. the cartridge was probably startet in the early 1950s and it was maybe right when all the bolt action rifles were surplussed but the original 6,5x55 was to good. very few rifles were ever change for this cartridge so it was obsolete before it startet.
you can have it for 150 euro in finland https://www.tori.fi/recommerce/forsale/item/9665453?ci=5