My copy is the Classic 58 mm version to your 74 mm Ambassador. I cannot tell you anything more as my case did not come with a manufacturer model ID number. However, a quick look over at SakWiki came up with this...https://www.sakwiki.com/tiki-browse_image.php?imageId=2026
What I can say is that these are stunning examples of beauty.
One of a matching pair of Ramblers, with a schrimshaw rendering of a picture from my wedding.(Image removed from quote.)
Wow. Just...wow.