Hi Gentleman
The cut-away image of the GVM fuse published by Nabob comes from a collection that is missing the front cover and imprint.
For the time being, it is therefore not possible to state its name and year of publication (according to the materials of the post-war edition) it is available globally. It is a collection containing details of fuse : Czech , Russian , Italian ,US , France , UK ... with a description of the function, cross-sectional drawings and possibly its shortcomings (according to Russian actuators). An interesting feature of the Russian ones is when and who constructed it.
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Fuse GVM is described in this literature as only limited wartime product for the following reasons: production capacity savings (it is more economical to produce). At the time of the evacuation of plants from the original to a new place of production.
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It is stated for the GVZM : the use of this igniter with HE ammunition (122mm, etc.) was not successful for explosions in the barrel and failed in the target. They state the reasons: the piston, which is made of leather, does not leak, and therefore after the piston is pressed and the compression space is insufficiently created, the igniter does not activate... In addition, it is insufficiently sealed... and sand and dirt enter the fuses space...