I can only offer the usual obvious comments. The Unknowns are women's watches which look Swiss inside and out. The octagonal one is older, by style and movement. A fairly early example of pinless setting. the movement was probably designed for a pendant or brooch watch. Mid 1910s to mid 1920s. The tonneau is somewhat newer; late '20s to 1930s. The form movement shows the greater maturity of wristwatch design by that stage.
Both seem to have good quality movements (the older one is particularly good for a woman's watch of its day), so I'd guess the cases are as good to match them. You're very lucky to have those original straps. It's the fine details that really make these watches special.