I will start the topic of marking and inscriptions on the model using decals and masks with an American loner enthusiast called Decalcomaniacs, at least because he is the only one who has decals for Christie’s tank
DM-053 T-3 Christie Light tank
BT tanks have a rich combat history. This is where I’m going to post stuff. Personally, I like Spain. For this theater of operations, there are, or rather were, decals from the Swedish BisonDecals
35 134 Republican T-26 & BT-5. Spanish Civil War.
And they were because the company was renamed and became known as Star Decals, respectively, and the set changed a little and became
35-С1174 Spanish Civil War # 6.
Another Spanish company FC Model Trend has a set
35220 BT-5 & BA-6 in Spain
And another ancient Spanish company Hispacalcas produced
Spanish Civil War (1936-39)
It was already included in the kitography T-26
Another foreign site for the use of BT tanks is Finland. The already mentioned BisonDecals has decals for this region.
35147 Finbish Tank Mix #1
And her successor Star Decals
35-C1042 Finnish Tanks in WW2 # 6.
A rare guest in this field is Chinese BT. The decals on them are made by the Chinese company Bestfong.
35004 Chinese Tank in WWII
There is also a marking for German captured tanks from the Polish Jadar-Model
Armo 35418 Captured Vehicles vol.2
and Echelon Fine Details
D356163 Beute BT-7
The bulk of the markings and inscriptions refer to the Soviet theme. Continue with the same manufacturer
D356161 BT-7s Model 1935, 1937 & BT-7M (53rd)
D356167 BT-7 Model 1937 (War Hero)
D356169 BT-7s Model 1935 & 1937 (34th, 1st)
The Russian online store A-model has products of its brand, incl. decals on the topic, and even in two parts
135009 BT-5, BT-7 Tanks. Part 1
135010 BT-5, BT-7 Tanks. Part 2
Russian Colibri Deals also have decals
35072 BT-7 М
And I will complete this subsection with the products of the now defunct Russian company Travers
35-002 BT tanks
Then it began to be called Begemot and may be known to you under this name, but this decal was not repeated.
But not only decals can be used for tactical marking. For geometrically simple things, I personally prefer stencils. This opportunity is provided to me by the Czech Eduard
XT048 BT-7 Markings
The production of kits from the Belarusian HobbyPlus has been discontinued due to the closure of the company.
В наборе есть и декали.
SU35118 BT-7 mod.1935
and in conclusion, a mysterious stencil from the Spanish valejo.
ST-AFV003 Soviet Numbers WWII
First, the material is not understandable, there is a suspicion that this is etching. Secondly, only from the commentary on the site it becomes clear that this is for BI and T-26