Help identifying watch(es) 6/10

[DanielR]

Hello,
I'm looking for assistance in finding information about a small collection of pocket watches.
(please can you guys here help, there are 9 English watches and 1 American. (I've made (or will make) a thread for each watch.)
Any information on the watch (good/not good/year/place of manufacture would be greatly received (I know nothing about watches, -but would like to know about these particular ones)
If there is anything you feel is missing from the photos, (or want better/different pictures to help identify these please let me know.
(all the watches work.)

the 6th watch appears to be made by "Vertex Revue"
It appears to be a steel movement put in a denisson "star" case. the case has serial number 333968

the glass is (unfortunately) cracked.

 

[roughbarked]

Remarks
open face calibre
different bridge shapes (cf. also Revue 30 open face)
negative stem mechanism
lever cock and banking pins (examples) or lever bridge with fixed banking (cf. Revue 30)
options:
Breguet hairspring (Fig.3, 5)
bimetallic screw balance (Fig.3)
cam disc regulator (Fig.3)
Revue 30/31
xample, year: signature; shock device
1-2) 1926: VWC (Vertex Watch Co.), Swiss Made, 7 Jewels - 855
3-4) ca. 1925: Prima, Swiss Made - 860
5-6) 1950: J.W. Benson, 62 & 64 Ludgate Hill, London, By. Warrant to H.M. the Late Queen Victoria, Swiss Made
(despite referring to Queen Victoria: 1950 is correct)