Some new measurements
Brand--------------------------HRC---------------- Chrome coating (mm)
Matador 190--------------------41--------------------0.085
Garant---------------------------41---------------------~0
Stahlwille-----------------------47----------------------~0
Matador 190 old series---------38--------------------0.15
HR (India) Lidl------------------34--------------------0.10
Bost-----------------------------49 -----------0.08
Dowidat No6 12-13-------------38--------------------0.10
Gedore No6 14-17--------------52 --------------0.10
Unior----------------------------47.5-------------------0.15
IUS------------------------------47 --------------0.05
Izeltas---------------------------44----------------------~0
Cobalt Ratcheting Wrench------45----------------------~0
Hazet 600N beam---------35--------------------0.17
----------------open end-------- 31---------------------~0
Facom 440----------------------44----------------------~0
Stanley 87-073------------------41----------------------?
We tried (specifically one of my colleagues because I am on vacation) to measure Stanley's chrome coating but ...

We didn't manage to measure a fixed value. From zero to 0.3 mm. This is a sign of poor quality.
Facom... Similar quality with Stahlwille. I'm impressed with this Taiwanese wrench!
View media item 32062
The thickest combination wrench i have tested