My initial thought on these two rounds was Bulgarian, but I don't see the typical factory codes on the projectiles, fuzes or cases. The font does not look normal for Russian, and I don't normally see any Cyrillic markings on Czech ordnance. Can someone steer me straight?
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Basically Russian (Warsaw Pack) style markings for Czechoslovakian made ammunition as far as I can tell. The markings a mix of Czech and Cyrillic (Russian). The latter may have been for an export customer of the Dana 152 mm self-propelled gun (SPG), or another 152 mm gun (see later text).
First projectile
152 = 152 mm calibre
OF Nh = OF = Oskolocho-Fygasnaya (Осколочно-фугасная), literally fragmentation-high explosive. The Nh is short for a word in Czech, I think it’s to do with training or inert, but can’t remember the word or expression?
KH-37 = Not my background, but I presume something like ‘Kanónová Koufnice vzor 37’, so ‘Gun-Howitzer model 37’ in English
N = projectile weight zone (váhový znak) = between 0% to +1/3%
+ = no idea, as there’s a weight zone marking already (the plus sign is used for weight zones too)?
Second projectile
ГТС = GTS = Powder filling and ammo-assembling plant ZVS, Dubnica nad Vahom (if this place is correct:
http://www.russianammo.org/Russian_Ammunition_Page_Headstamp.html)
1-89 = Batch and year
152 = 152 mm calibre
Н = N = weight zone again
Propellant charge
УЧЕБНЫЙ = UChEBNYY = training
ПОЛНЫЙ = POLNYY = Full, as in full charge
ЖН-546 = ZhN-546 = short form version of 54-ZhN-546 = this is the propellant charge's GAU/GRAU designation
152-Д-20 = 152-D-20 = 152 mm D-20 gun
152-37 = 152 mm Model 1937 Gun-Howitzer
152-СПГ-77 = 152-SPG-77 = I presume this is the Dana SPG (Samohybná kanónová houfnice vz. 77 Dana)
НДТ-3 16/1 = NDT-3 16/1 = propellant type (nitroglycerine + DNT + dibutyl phthalate, calorific class 3) and its geometry (tubular [1], wall thickness 1.8 mm)
1/87 НМА = 1/87 NMA = Batch - Year - Manufacture (powder manufacturer Syntesia, Pardubice-Semtin) of the NDT-3 16/1 propellant
8/1 УГ = 8/1 UG = propellant geometry (tubular [1], wall thickness 1.0 mm) and type (nitrocellulose to which a flash suppressant has been added)
1/86 НМА = 1/86 NMA = Batch - Year - Manufacturer of the 8/1 UG propellant
1-87-ГТС = 1-87-GTS = Batch - Year - Manufacturer, so markings covering the assembling/filling of the cartridge case