I believe Heliduplex model came out in 1931. Here is a close up of the drawing from the 1939 VC catalog - doesn't match:
https://www.verney-carron.com/pdf/catalogue-1939-FR-Verney-Carron.pdf

[Linked Image from jpgbox.com]

This is a 2017 comment sourced to IGC:
"The Héluduplex model was a high-end gun at Verney-Carron. mechanic H & H with a top fastner, VC calls it Heluduplex but it is in fact just a variety of Scott's "screw-grip"

Last edited by Argo44; 05/28/21 05:59 PM.

Baluch are not Brahui, Brahui are Baluch