That 97, is simply an arbitrary serial on the ejector box, this is not the model “97” which you have included a screenshot from. The transitional action, as they are commonly referred to, that you are hinting at, has a far different bolt shroud forging, long cocking piece, different bolt cam, small front receiver ring diameter etc. Not to say they couldn’t turn up from other makers, but to date the only ones I’ve seen have been from Mauser proper, and also actions sold to the trade, completed by, JP Sauer, and Rigby. Yours was made a few to several years after those actions IMO.