Barra 5-25 MilDot reticle true scale zoom setting

This week I decided to dust off my Japanese Barra 5-25 scope with Mildot reticle for my other FT gun this week. It is second focal plane scope but I can’t find any where at what zoom level the Mildot reticle is true to scale.

So I decided to markup a target with 1cm spacing at 20 meters to find true to scale zoom level. Usually SFP scopes are true at 10x but this scope seems to be true at 12x. Does anyone have information on which zoom level on this darn scope is true? So little information on this scope, user manual is simply useless.

TIA
 
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