Can you help me identify these watch parts that fell off a vintage Le Jour manual skin-diver movement?

[Horolozee]

Hello everyone!

I recently stripped down an old Continental skin-diver with a Le Jour branded movement inside. It is a manual wind with a date function, but to be honest I am unsure the caliber as I have been unsuccessful finding any info on old Le Jours or Yema watches for the matter. During the disassembly, I realized two pieces had fallen off the movement: a U-shaped spring and what looks to be a washer. Before I went ahead with reassembling the watch and attempting to parse together where they go, I thought I'd ask around here if anyone could identify these parts. 

First Pic: the two pieces, potentially from the calendar works?

Second Pic: two pieces with springs from calendar work and keyless work with escapement for scale

Third Pic: the watch movement in all it's humble glory

If anyone has any ideas let me know. Thanks!

Edited July 20, 2022 by Horolozee
Added further pictures

[Kalanag]

Looks like an FHF 974

http://www.ranfft.de/cgi-bin/bidfun-db.cgi?00&ranfft&&2uswk&FHF_974

The FHF 974 Parts List

and here a Video of the FHF 97 (w/o calendar)

Edited July 20, 2022 by Kalanag

[Horolozee]

Spot on! Thanks for the identification and the resources. You are most certainly correct. 

If you don't mind me asking - how were you able to identify the movement? Just from experience? 

[Kalanag]

„Google picture search“ is my friend